All questions of Biotechnology & its Applications for NEET Exam

Statement 1: Transgenic mouse is termed as super mouse because it is twice big in size than the normal mouse.
Statement 2: In super mouse, the gene for human growth factor has been introduced and expressed.

The correct answer is option 'A' - Statement 1 is incorrect, but statement 2 is correct.

Explanation:
Transgenic Mouse:
A transgenic mouse is a genetically modified mouse that carries genes from other species, often human genes. These genes are introduced into the mouse genome through genetic engineering techniques. Transgenic mice are widely used in medical research to study the function of genes and to model human diseases.

Statement 1: Transgenic mouse is termed as super mouse because it is twice big in size than the normal mouse.
This statement is incorrect. The term "super mouse" is not specifically used to describe the size of a transgenic mouse. Transgenic mice can be engineered to express specific traits or genes, but these traits can vary depending on the purpose of the study. Size may or may not be a characteristic of a transgenic mouse, and it is not a defining feature of transgenic mice in general.

Statement 2: In super mouse, the gene for human growth factor has been introduced and expressed.
This statement is correct. Transgenic mice can be engineered to express specific genes from other species, including human genes. In this case, the gene for a human growth factor has been introduced into the transgenic mouse and is being expressed. This genetic modification allows researchers to study the effects of the human growth factor in a mouse model, which can provide insights into human biology and potential therapeutic applications.

Conclusion:
In conclusion, statement 1 is incorrect because the term "super mouse" is not specifically related to the size of a transgenic mouse. However, statement 2 is correct as transgenic mice can be engineered to express specific genes, including human genes such as the gene for a human growth factor.

Introduction
The patenting of rice varieties has sparked significant debate, particularly when a U.S. company patents a variety predominantly found in countries like India. Among these varieties, Basmati rice stands out as a notable example.
What is Basmati Rice?
- Basmati rice is known for its unique aroma, long grains, and fluffy texture.
- It has been cultivated in the Indian subcontinent for centuries and is a staple in various traditional dishes.
Patenting Issues
- In the late 1990s, a U.S. company, RiceTec, patented hybrid varieties that they claimed to be Basmati.
- This patent raised concerns among Indian farmers and stakeholders who argued that Basmati is a traditional variety that has been cultivated for generations in India and Pakistan.
Consequences of Patenting
- The patent led to legal battles over the rights to the name "Basmati."
- It highlighted the complexities of intellectual property rights in agriculture, especially concerning indigenous crops.
Conclusion
The case of Basmati rice serves as a significant example of the intersection between traditional agricultural practices and modern patent laws. Despite the patenting attempts, the highest number of Basmati rice varieties continues to be cultivated in India, emphasizing the importance of preserving indigenous agricultural heritage while navigating the challenges posed by globalization and intellectual property rights.

Answer:

Eli Lilly is the company that started selling Humulin in the year 1983.

Explanation:

Humulin is a type of insulin used to treat diabetes, and it was the first genetically engineered drug to be approved by the US Food and Drug Administration (FDA). The development of Humulin was a joint effort between Eli Lilly and Genentech, but Eli Lilly was the company responsible for marketing and selling the drug.

The approval of Humulin in 1982 marked a significant milestone in the field of biotechnology and paved the way for the development of more genetically engineered drugs. Eli Lilly has since continued to be a major player in the diabetes market, developing and marketing other insulin products such as Humalog and Basaglar.

In summary, Eli Lilly started selling Humulin in the year 1983, making it the first genetically engineered drug to be marketed and sold to the public.

Broad patent category refers to patents that cover a large category of organisms or genetic material. In this case, the correct answer is option 'B' - Oryza.

Explanation:

- Triticum: It is a genus of plants that includes wheat species. However, it is not a broad patent category as it refers to a specific genus of plants.
- Pissum sativum: It is the scientific name for peas. Similar to Triticum, it refers to a specific plant species and not a broad patent category.
- Brassica: It is a genus of plants that includes several species such as mustard, cabbage, and broccoli. However, it is not a broad patent category as it refers to a specific genus of plants.
- Oryza: It is a genus of plants that includes several species of rice. Oryza has been covered under the broad patent category as it refers to a large category of organisms.

In conclusion, the correct answer is option 'B' - Oryza as it has been covered under the broad patent category.

Test to confirm HIV infection

The doctor in this scenario needs to get tested to confirm if he has contracted HIV. The test that he needs to take is the Polymerase Chain Reaction (PCR) test.

Explanation

PCR is a highly accurate and sensitive test that detects the genetic material (RNA) of the virus in the blood. It can detect the virus even in the early stages of infection before antibodies are produced by the body. This makes it the most reliable test to confirm HIV infection, especially in cases where there is a risk of transmission through accidental exposure like in this scenario.

Other tests like routine urine examination, Total Leukocyte Count (TLC), and Differential Leukocyte Count (DLC) are not specific for HIV and cannot detect the virus. They may indicate an infection or inflammation in the body but cannot confirm HIV.

Therefore, if the doctor wants to rule out or confirm his suspicion of HIV infection, he should undergo PCR testing. Early detection and treatment can significantly improve the quality of life of people living with HIV and prevent the progression of the disease.

Explanation:
During the processing of proinsulin into the mature insulin, the C-peptide is removed from proinsulin.

Proinsulin is a single chain polypeptide consisting of three regions: the N-terminal B-chain, the C-terminal A-chain, and a connecting peptide (C-peptide) in the middle. The connecting peptide or C-peptide is important because it connects the B-chain and A-chain of proinsulin.

During the processing of proinsulin, the C-peptide is cleaved enzymatically from the precursor molecule. This cleavage reaction is catalyzed by proteolytic enzymes called prohormone convertases (PCs) in the secretory granules of pancreatic beta-cells.

Once the C-peptide is removed, the remaining A and B chains of proinsulin are held together by disulfide bonds to form mature insulin. Mature insulin is then secreted into the bloodstream in response to increased glucose levels.

The removal of C-peptide is important for two reasons:

1. Regulation of insulin secretion: C-peptide is co-secreted with insulin in equimolar amounts, and its removal allows for more precise control of insulin secretion.

2. Diagnostic value: C-peptide levels can be measured in blood to assess insulin secretion and to differentiate between type 1 and type 2 diabetes. Since C-peptide has a longer half-life than insulin, measuring C-peptide levels can provide a more accurate assessment of insulin secretion over time.

In conclusion, during the processing of proinsulin into mature insulin, the C-peptide is enzymatically cleaved from the precursor molecule, leaving the A and B chains of insulin held together by disulfide bonds.

The foreign genesc) It could potentially prevent the development of genetic disorders or diseases before they occurd) It could allow for more targeted and precise gene editing, as the cells and tissues are still developing and more malleablee) It could potentially eliminate the need for gene therapy later in life, as the corrected genes would be present from the beginningf) It could potentially improve the overall health and quality of life for individuals with genetic disorders or diseasesg) It could allow for the correction or modification of multiple genes simultaneously, addressing multiple issues at onceh) It could potentially prevent the transmission of genetic disorders or diseases to future generationsi) It could allow for early intervention and personalized treatment plans, leading to better outcomes and prognosis for individuals with genetic disorders or diseases.

Transgenic Animals

Transgenic animals are those animals that have been genetically modified by the insertion of foreign DNA into their genome. This technology is widely used in biomedical research and biotechnology to study gene function, produce medically important proteins, and develop new therapies.

Foreign DNA in all of its cells

The correct answer to the question is option C, which is "Foreign DNA in all of its cells." This means that transgenic animals have foreign DNA integrated into their genome in every cell of their body. This is usually accomplished by injecting foreign DNA into the pronucleus of a fertilized egg, which is then implanted into a surrogate mother.

Applications of Transgenic Animals

Transgenic animals have many applications in biomedical research and biotechnology, including:

1. Production of therapeutic proteins: Transgenic animals can be engineered to produce human proteins that are used in medicine, such as insulin, growth hormones, and clotting factors.

2. Disease modeling: Transgenic animals can be used to model human diseases, such as cancer, Alzheimer's disease, and cystic fibrosis.

3. Gene therapy: Transgenic animals can be used to test and develop gene therapy treatments for genetic diseases.

4. Agricultural applications: Transgenic animals can be engineered to have desirable traits, such as increased milk production or disease resistance.

5. Conservation: Transgenic animals can be used to save endangered species by introducing beneficial genes into their populations.

Conclusion

In conclusion, transgenic animals are those animals that have been genetically modified by the insertion of foreign DNA into their genome. This technology has many applications in biomedical research and biotechnology and has the potential to improve human health and conserve endangered species.

Explanation:

Definition of Bio-fertilizer:
Bio-fertilizers are a type of fertilizers that contain living microorganisms, such as bacteria, fungi, and algae, which enhance the nutrient availability and uptake by plants. These microorganisms establish a symbiotic relationship with the plant roots and promote their growth by fixing atmospheric nitrogen, solubilizing phosphorus, producing growth-promoting substances, and suppressing plant pathogens.

Options:
a) Bacillus thuringiensis
b) Anabaena
c) Nostoc
d) Rhizobium

Explanation of each option:

a) Bacillus thuringiensis:
Bacillus thuringiensis (Bt) is a bacterium that produces crystal proteins toxic to certain insect pests. It is widely used as a biological insecticide to control pests in agriculture and forestry. However, it is not used as a bio-fertilizer as it does not have the ability to fix nitrogen or solubilize phosphorus.

b) Anabaena:
Anabaena is a genus of filamentous cyanobacteria that are capable of fixing atmospheric nitrogen. They form symbiotic associations with certain plants, such as Azolla (a floating aquatic fern), and provide them with nitrogen. Anabaena is commonly used as a bio-fertilizer in paddy fields to enhance nitrogen availability for rice plants.

c) Nostoc:
Nostoc is another genus of filamentous cyanobacteria that can fix atmospheric nitrogen. Like Anabaena, Nostoc forms symbiotic associations with certain plants and contributes to nitrogen fixation. It is also used as a bio-fertilizer in paddy fields.

d) Rhizobium:
Rhizobium is a genus of soil bacteria that form symbiotic associations with leguminous plants (plants belonging to the family Fabaceae). These bacteria infect the root nodules of legumes and convert atmospheric nitrogen into a form that can be utilized by the plant. Rhizobium is widely used as a bio-fertilizer for leguminous crops like peas, beans, and clover.

Conclusion:
Among the given options, Bacillus thuringiensis is not used as a bio-fertilizer because it does not possess the ability to fix nitrogen or solubilize phosphorus. The other options, Anabaena, Nostoc, and Rhizobium, are commonly used as bio-fertilizers due to their nitrogen-fixing capabilities.

Understanding Genetic Engineering
Genetic engineering is a powerful technique that allows scientists to modify an organism's DNA. This capability hinges on several key processes, one of which is the ability to cut DNA at specific sites.
Key Process: Cutting DNA
- Genetic engineering is fundamentally reliant on the ability to manipulate DNA.
- Endonucleases, particularly restriction endonucleases, are essential tools in this process.
- These enzymes can recognize specific nucleotide sequences in the DNA and cleave it at designated locations.
Role of Restriction Endonucleases
- Purified restriction endonucleases obtained from bacteria are widely used in laboratory settings.
- They enable scientists to cut DNA at predictable sites, facilitating the insertion or deletion of specific genes.
- This precision allows for the creation of recombinant DNA, where DNA from different sources can be joined together.
Importance of Specificity
- The specificity of these enzymes ensures that only targeted sequences are modified, minimizing unintended changes to the organism's genome.
- The ability to manipulate DNA in this manner has led to advances in biotechnology, medicine, and agriculture.
Conclusion
While other options, such as transduction and visualization of DNA, play roles in genetics, they do not directly enable the precise modification of DNA. The capacity to cut DNA at specific sites is the cornerstone of genetic engineering, making option 'A' the correct answer.

Cloning of Bt toxin gene from bacteria and expression in plants has been a major breakthrough in providing resistance to insects without the need for insecticides. Several crops have been genetically modified using this technology to protect them from insect pests.

List of Plants Modified using Bt Toxin Gene:

- Cotton: Cotton plants have been genetically modified using Bt toxin gene to protect them from bollworms. The Bt cotton variety has been successful in reducing the damage caused by bollworms and increasing the cotton yield.

- Corn: Corn plants have also been genetically modified using Bt toxin gene to provide protection against European corn borer and corn earworm. The Bt corn variety has been widely adopted by farmers in the United States and other countries.

- Rice: Rice plants have been genetically modified using Bt toxin gene to protect them from the yellow stem borer. The Bt rice variety is currently being tested in several countries.

- Potato: Potato plants have been genetically modified using Bt toxin gene to protect them from the Colorado potato beetle. The Bt potato variety has been approved for cultivation in several countries.

- Tomato: Tomato plants have been genetically modified using Bt toxin gene to protect them from the tomato fruitworm. The Bt tomato variety is currently being tested in several countries.

- Soybean: Soybean plants have been genetically modified using Bt toxin gene to protect them from the soybean looper and velvetbean caterpillar. The Bt soybean variety is currently being tested in several countries.

Conclusion:

In conclusion, several crops have been genetically modified using Bt toxin gene to provide resistance to insects without the need for insecticides. The Bt crops have been successful in reducing the damage caused by insect pests and increasing the crop yield.

Genetic Modification of Crops

Introduction:
Genetic modification of crops involves the alteration of the genetic material of plants to achieve desirable traits. This can be done through various techniques such as gene insertion, gene deletion, and gene editing.

Statement:
The correct answer is option 'B' - Genetic modification of crops does not result in decreased efficiency of mineral usage by plants.

Explanation:
Genetic modification of crops has several benefits and can lead to various improvements in plants. However, it is important to note that not all statements regarding genetic modification are correct. Let's examine each option and understand why option 'B' is not correct.

a) It makes crops more tolerant to abiotic stresses:
Genetic modification can introduce genes into crops that enhance their tolerance to abiotic stresses such as drought, salinity, and extreme temperatures. This can improve crop productivity and sustainability in challenging environments.

b) It results in decreased efficiency of mineral usage by plants:
This statement is incorrect. Genetic modification techniques can be used to improve the efficiency of mineral usage by plants. For example, genes can be inserted into crops to enhance their ability to take up and utilize essential minerals from the soil, resulting in improved nutrient uptake and utilization efficiency.

c) It helps to reduce post-harvest losses:
Genetic modification can help reduce post-harvest losses by enhancing traits such as disease resistance and improved shelf life. For example, crops can be genetically modified to have increased resistance to pests and diseases, reducing the risk of post-harvest losses due to these factors.

d) It enhances the nutritional value of food:
Genetic modification can be used to enhance the nutritional value of food by increasing the levels of essential nutrients or bioactive compounds. For example, crops can be genetically modified to have increased levels of vitamins, minerals, or antioxidants, resulting in improved nutritional content.

Conclusion:
Genetic modification of crops offers various benefits, including increased tolerance to abiotic stresses, reduction of post-harvest losses, and enhancement of nutritional value. However, it does not result in decreased efficiency of mineral usage by plants, as option 'B' incorrectly suggests.

Importance of Early Diagnosis and Understanding Pathophysiology in Effective Disease Treatment

Early diagnosis and understanding of the pathophysiology of a disease are crucial for effective treatment. Let's explore why.

1. Early Diagnosis
Early diagnosis of a disease allows for prompt treatment, which can improve outcomes and even save lives. When a disease is caught early, it may be easier to treat before it progresses or causes irreversible damage. For example, early detection of cancer can increase the chances of successful treatment and cure. Additionally, early diagnosis can prevent the spread of infectious diseases to others.

2. Understanding Pathophysiology
To effectively treat a disease, it is essential to understand its underlying pathophysiology. Pathophysiology refers to the functional changes that occur in the body as a result of a disease. By understanding the mechanisms of a disease, healthcare providers can tailor treatments to target the specific processes involved. For example, understanding the pathophysiology of asthma can lead to the development of medications that target the airway inflammation and bronchoconstriction that cause asthma symptoms.

3. Importance of Early Diagnosis and Understanding Pathophysiology Together
Early diagnosis and understanding of pathophysiology work together to provide the best possible treatment for a disease. Without early diagnosis, a disease may progress too far for effective treatment. Without understanding pathophysiology, treatments may not effectively target the underlying mechanisms of the disease and may be less effective or even harmful. Together, early diagnosis and understanding pathophysiology can lead to the most effective and tailored treatment plans for each patient.

In conclusion, early diagnosis and understanding pathophysiology are both crucial for effective disease treatment. Without either of these components, treatment may be less effective or even harmful. Therefore, it is essential to prioritize both early diagnosis and understanding pathophysiology in healthcare.

For producing human insulin
c)Transgenic plants for increased resistance to pests and diseases
d)All of the above

The correct answer is d) All of the above. Genetic engineering has been used in various fields including medicine, agriculture, and biotechnology to produce transgenic organisms with desired traits or functions. Transgenic mice have been used for safety testing of vaccines, transgenic cows for producing human insulin, and transgenic plants for increased resistance to pests and diseases.

Introduction:
In order to protect cotton plants from cotton bollworms, scientists introduced specific genes into cotton that produce proteins toxic to these pests. The most commonly used genes in genetically modified cotton are CrylAc and CryllAb.

Explanation:
CrylAc gene:
- The CrylAc gene comes from Bacillus thuringiensis (Bt), a soil bacterium that produces a toxin harmful to many insect pests.
- This gene codes for a protein called CrylAc, which is toxic to the larvae of cotton bollworms.
- When the cotton plant expresses this gene, it produces the CrylAc protein, which binds to the gut lining of the cotton bollworm larvae, causing the gut to rupture and leading to the death of the pest.

CryllAb gene:
- The CryllAb gene is another variant of the Bt gene, also derived from Bacillus thuringiensis.
- It codes for a slightly different protein called CryllAb, which is also toxic to cotton bollworms.
- Similar to CrylAc, when the cotton plant expresses this gene, it produces the CryllAb protein, which acts in the same way by binding to the gut lining of the cotton bollworm larvae and causing their death.

Why CrylAc and CryllAb?
- Cotton bollworms (Helicoverpa armigera) are among the most destructive pests for cotton crops, causing significant yield losses.
- The use of CrylAc and CryllAb genes in genetically modified cotton has been proven to effectively control these pests.
- These genes provide an environmentally friendly alternative to chemical insecticides, as the proteins produced by the genes are specific to cotton bollworms and do not harm other organisms.

Conclusion:
The correct answer is option 'c' (CrylAc and CryllAb). These genes were introduced in cotton to protect it from cotton bollworms as they produce toxic proteins that specifically target and kill these pests, providing an effective and environmentally friendly pest control method for cotton crops.

Hirudin is a protein that prevents blood clotting. It is produced from transgenic Brassica napus, a plant known as rapeseed. Here is a detailed explanation of the answer:

Transgenic Brassica napus
- Transgenic plants are those that have undergone genetic modification to express a desired trait.
- Brassica napus is a plant in the mustard family that is commonly used for oilseed production.
- In this case, the plant has been genetically modified to produce hirudin.

Hirudin
- Hirudin is a protein that is naturally found in the saliva of leeches.
- It is a potent anticoagulant, meaning it prevents blood clotting.
- Hirudin works by inhibiting the activity of thrombin, an enzyme that plays a key role in blood clotting.

Medical applications of hirudin
- Hirudin has been used as a therapeutic agent for certain medical conditions.
- It has been used to prevent blood clots in patients undergoing surgery or those with a high risk of developing blood clots.
- Hirudin has also been used to treat certain types of heart attacks and strokes.

Production of hirudin in transgenic plants
- The genetic modification of Brassica napus involves the introduction of a gene that encodes for hirudin.
- The gene is typically introduced using a vector, which is a carrier molecule that can deliver the gene into the plant's cells.
- Once the gene is integrated into the plant's genome, it is expressed and the plant produces hirudin.
- The hirudin can then be extracted from the plant and purified for use in medical applications.