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Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology.  Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease.  Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies.  Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups.  Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system.  These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life.  This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.
Which of the following can be inferred from the passage?
  • a)
    Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.
  • b)
    Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.
  • c)
    The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in that person
  • d)
    Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.
  • e)
    In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Neurodegenerative diseases were once considered disorders of the mind ...
Passage Analysis
Summary and Main Point
Pre-Thinking
This is an Inference question. The correct answer will follow closely from the given information in the passage, although it may not be explicitly stated in the passage.
Answer Choices
A
Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.
Incorrect: Out of Scope
The author gives no information to deduce anything regarding the chances of such people developing the disease.
B
Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.
Incorrect: Out of Scope
The author neither mentions nor indicates towards any such relationship. The sense of smell is mentioned in the last sentence of the passage in a completely different context.
C
The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in that person
Correct
This information can be deduced on the basis of the findings mentioned in the passage and the author’s statement to explain the findings. As per the author it is not uncommon to have dormant reservoirs of the virus. The author draws this statement to explain the findings of the study that showed that samples from both healthy and diseased tissues showed the presence of the virus.
D
Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.
Incorrect: Partial Scope
The passage gives no specific information about the viruses causing other neurodegenerative diseases for us to be able to deduce the following portion of the answer choice :
alongwith other neurodegenerative diseases
E
In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.
Incorrect: Out of Scope
Although the limbic system is described as a place where viruses like to reactivate but the limbic system is only one of many targets for the virus. So, we do not know where else the virus could/would reactivate.
 
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Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimers disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Why does the author say Infection via the nasal passage is probably quite common?

Globally, about a third of the food produced for human consumption goes to waste, implying that a third of the water, land use, energy and financial resources that go into producing it are also squandered. Yet people often think of food as environmentally benign because it is biodegradable, while label food packaging as a wasteful use of resources leading to nothing but more pollution, despite the reality that the energy that goes into packaging makes up a mere 10% of the total energy that goes into producing, transporting, storing and preparing food. Needless to say, their view ignores the negative impact of food production, supply, and consumption, and the benefits possible from the right kind of food packaging.Indeed the dislike for food packaging is not all baseless. There is a lot of bad and wasteful packaging out there. But any assessment of its impact on the environment must take into account the benefits one can derive from packaging in the shape of reduced food waste that can be realized by protecting and dispensing food properly. For instance, two percent of the milk produced in the US goes bad on supermarket shelves before it can be purchased. This dairy waste can be avoided with packaging technology such as Tetra Pak that saves milk from spoiling, even without refrigeration. However, environmentally aware consumers tend to dislike Tetra Pak material because they think it cannot be recycled. The truth, however, is that it can be recycled, but the process is rather complicated. Irrespective of the recycling aspect, Tetra Pak is a good environmental bet because it can extend the shelf life of milk up to nine months, reducing the need for refrigeration and reducing the amount of milk that goes bad on retail shelves. Clearly, the environmental benefit of the food-protection technology outweighs the negative impact of the packaging itself.Which of the following statement can be derived from the passage?

Globally, about a third of the food produced for human consumption goes to waste, implying that a third of the water, land use, energy and financial resources that go into producing it are also squandered. Yet people often think of food as environmentally benign because it is biodegradable, while label food packaging as a wasteful use of resources leading to nothing but more pollution, despite the reality that the energy that goes into packaging makes up a mere 10% of the total energy that goes into producing, transporting, storing and preparing food. Needless to say, their view ignores the negative impact of food production, supply, and consumption, and the benefits possible from the right kind of food packaging.Indeed the dislike for food packaging is not all baseless. There is a lot of bad and wasteful packaging out there. But any assessment of its impact on the environment must take into account the benefits one can derive from packaging in the shape of reduced food waste that can be realized by protecting and dispensing food properly. For instance, two percent of the milk produced in the US goes bad on supermarket shelves before it can be purchased. This dairy waste can be avoided with packaging technology such as Tetra Pak that saves milk from spoiling, even without refrigeration. However, environmentally aware consumers tend to dislike Tetra Pak material because they think it cannot be recycled. The truth, however, is that it can be recycled, but the process is rather complicated. Irrespective of the recycling aspect, Tetra Pak is a good environmental bet because it can extend the shelf life of milk up to nine months, reducing the need for refrigeration and reducing the amount of milk that goes bad on retail shelves. Clearly, the environmental benefit of the food-protection technology outweighs the negative impact of the packaging itself.Which of the following is the function of the first paragraph in the passage?

Globally, about a third of the food produced for human consumption goes to waste, implying that a third of the water, land use, energy and financial resources that go into producing it are also squandered. Yet people often think of food as environmentally benign because it is biodegradable, while label food packaging as a wasteful use of resources leading to nothing but more pollution, despite the reality that the energy that goes into packaging makes up a mere 10% of the total energy that goes into producing, transporting, storing and preparing food. Needless to say, their view ignores the negative impact of food production, supply, and consumption, and the benefits possible from the right kind of food packaging.Indeed the dislike for food packaging is not all baseless. There is a lot of bad and wasteful packaging out there. But any assessment of its impact on the environment must take into account the benefits one can derive from packaging in the shape of reduced food waste that can be realized by protecting and dispensing food properly. For instance, two percent of the milk produced in the US goes bad on supermarket shelves before it can be purchased. This dairy waste can be avoided with packaging technology such as Tetra Pak that saves milk from spoiling, even without refrigeration. However, environmentally aware consumers tend to dislike Tetra Pak material because they think it cannot be recycled. The truth, however, is that it can be recycled, but the process is rather complicated. Irrespective of the recycling aspect, Tetra Pak is a good environmental bet because it can extend the shelf life of milk up to nine months, reducing the need for refrigeration and reducing the amount of milk that goes bad on retail shelves. Clearly, the environmental benefit of the food-protection technology outweighs the negative impact of the packaging itself.The author is primarily concerned with

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Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Which of the following can be inferred from the passage?a)Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.b)Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.c)The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in thatpersond)Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.e)In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.Correct answer is option 'C'. Can you explain this answer?
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Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Which of the following can be inferred from the passage?a)Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.b)Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.c)The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in thatpersond)Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.e)In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.Correct answer is option 'C'. Can you explain this answer? for GMAT 2024 is part of GMAT preparation. The Question and answers have been prepared according to the GMAT exam syllabus. Information about Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Which of the following can be inferred from the passage?a)Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.b)Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.c)The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in thatpersond)Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.e)In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for GMAT 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Which of the following can be inferred from the passage?a)Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.b)Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.c)The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in thatpersond)Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.e)In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.Correct answer is option 'C'. Can you explain this answer?.
Solutions for Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Which of the following can be inferred from the passage?a)Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.b)Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.c)The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in thatpersond)Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.e)In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for GMAT. Download more important topics, notes, lectures and mock test series for GMAT Exam by signing up for free.
Here you can find the meaning of Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Which of the following can be inferred from the passage?a)Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.b)Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.c)The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in thatpersond)Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.e)In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Which of the following can be inferred from the passage?a)Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.b)Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.c)The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in thatpersond)Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.e)In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.Correct answer is option 'C'. Can you explain this answer?, a detailed solution for Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Which of the following can be inferred from the passage?a)Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.b)Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.c)The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in thatpersond)Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.e)In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Which of the following can be inferred from the passage?a)Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.b)Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.c)The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in thatpersond)Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.e)In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Neurodegenerative diseases were once considered disorders of the mind that were deeply rooted in psychology. Now viruses rank among the environmental factors thought to trigger brain-ravaging diseases such as multiple sclerosis (MS) and Alzeimer’s disease. Human herpesvirus-6 (HHV-6), in particular, has been linked to MS in past studies. Neuroscientists have determined that the virus makes its entry to the human brain through the olfactory pathway, right along with the odors wafting into our nose. The researchers tested samples of brain cells from people with MS and healthy control subjects and found evidence of the virus in the olfactory bulb in both groups. Infection via the nasal passage is probably quite common, as is harboring a dormant reservoir of HHV-6, but in people with MS, the virus is active. The virus appears to invade the brain by infecting a type of glial cell called olfactory ensheathing cells (OECs), which nourish smell-sensing neurons and guide the virus from the olfactory bulb to their targets in the nervous system. These targets include the limbic system, a group of evolutionarily old structures deep in the brain, which is where viruses like to reactivate. The olfactory neurons and their OECs are among the few brain cells known to regenerate throughout our life. This neurogenesis may keep our sense of smell sharp, but at the cost of providing the virus the opportunity to spread.Which of the following can be inferred from the passage?a)Those who possess higher concentrations of HHV-6 in the olfactory bulb are at a high risk of developing multiple sclerosis.b)Those who have a sharper sense of smell are at a greater risk of multiple sclerosis.c)The absence of multiple sclerosis in a person does not necessarily indicate an absence of the disease causing virus in thatpersond)Multiple sclerosis, alongwith other neurodegenerative diseases, can have disease causing viruses lying dormant in the human body without any external symptom of the same.e)In the absence of the limbic system, it would be difficult for the HHV-6 virus to reactivate.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice GMAT tests.
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