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Test: Virus - 1 - NEET MCQ


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15 Questions MCQ Test - Test: Virus - 1

Test: Virus - 1 for NEET 2024 is part of NEET preparation. The Test: Virus - 1 questions and answers have been prepared according to the NEET exam syllabus.The Test: Virus - 1 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Virus - 1 below.
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Test: Virus - 1 - Question 1

The figure given below shows the structure of a bacteriophage. Identify its parts labelled as A, B, C and D.
Viruses

Detailed Solution for Test: Virus - 1 - Question 1

Topic in NCERT: VIRUSES, VIROIDS, PRIONS AND LICHENS

Line in NCERT: "These capsomeres are arranged in helical or polyhedral geometric forms."

Test: Virus - 1 - Question 2

In which of the following DNA is not present :-

Detailed Solution for Test: Virus - 1 - Question 2

Tobacco mosaic virus is a Plant virus and mostly plant viruses have single stranded RNA  as their genetic material. 

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Test: Virus - 1 - Question 3

Which of the following is true for a virus :-

Detailed Solution for Test: Virus - 1 - Question 3

Viruses are obligate parasites. In addition to proteins, viruses also contain genetic material, that could be either RNA or DNA. No virus contains both RNA and DNA.

. In general, viruses that infect plants have single stranded RNA and viruses that infect animals have either single or double stranded RNA or double stranded DNA

Topic in NCERT: VIRUSES, VIROIDS, PRIONS AND LICHENS

Line in NCERT: "In addition to proteins, viruses also contain genetic material, that could be either RNA or DNA."

Test: Virus - 1 - Question 4

Mumps is caused by:

Detailed Solution for Test: Virus - 1 - Question 4

  • Mumps is a viral infection caused by the mumps virus.
  • Mumps is extremely infectious and spreads quickly to people living nearby.
  • The virus is spread through respiratory droplets or through direct contact with an infected human.
  • It mainly affects salivary glands in the region of our ears and can cause inflammation in one or both of these glands. Mumps affect the parotid glands, the salivary glands behind and in front of the ears.
  • When contracting mumps, the virus travels from the respiratory tract to the salivary glands and reproduces, causing the glands to swell.

Topic in NCERT: VIRUSES, VIROIDS, PRIONS AND LICHENS

Line in NCERT: "Viruses cause diseases like mumps, small pox, herpes and influenza."

Test: Virus - 1 - Question 5

Tobbaco Mosaic Virus (TMV) contains:

Detailed Solution for Test: Virus - 1 - Question 5

  • Tobacco mosaic virus (TMV) is a positive-sense single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae.
  • The infection causes characteristic patterns, such as "mosaic"-like mottling and discoloration on the leaves.

Topic in NCERT: VIRUSES, VIROIDS, PRIONS AND LICHENS

Line in NCERT: "In general, viruses that infect plants have single stranded RNA and viruses that infect animals have either single or double stranded RNA or double stranded DNA."

Test: Virus - 1 - Question 6

Which of the following organisms did not find a place in Whittaker's five kingdom classification due to their non-cellular structure?

Detailed Solution for Test: Virus - 1 - Question 6

  • Viruses were not included in Whittaker's five kingdom classification because they lack cellular structure.
  • Viruses are non-cellular and consist of genetic material (either RNA or DNA) enclosed in a protein coat.
  • They are considered obligate parasites and cannot replicate on their own.

Topic in NCERT: Viruses, Viroids and Lichens

Line in NCERT: "In the five kingdom classification of Whittaker there is no mention of lichens and some acellular organisms like viruses, viroids and prions." "Viruses did not find a place in classification since they are not considered truly ‘living', if we understand living as those organisms that have a cell structure." "The viruses are non-cellular organisms that are characterised by having an inert crystalline structure outside the living cell." "Some acellular organisms like viruses and viroids as well as the lichens are not included in the five kingdom system of classification."

Test: Virus - 1 - Question 7

Who was the scientist that recognized certain microbes as the causal organism of the mosaic disease of tobacco?

Detailed Solution for Test: Virus - 1 - Question 7

Dmitri Ivanowsky was the scientist who recognized certain microbes as the causal organism of the mosaic disease of tobacco. These were found to be smaller than bacteria because they passed through bacteria-proof filters

Topic in NCERT: VIRUSES

Line in NCERT: "Dmitri Ivanowsky (1892) recognised certain microbes as causal organism of the mosaic disease of tobacco."

Test: Virus - 1 - Question 8

The literal meaning of virus is a:

Detailed Solution for Test: Virus - 1 - Question 8

Virus means venom or poisonous fluid.

Topic in NCERT: VIRUSES, VIROIDS, PRIONS AND LICHENS

Line in NCERT: "Virus means venom or poisonous fluid."

Test: Virus - 1 - Question 9

Which among the following are incorrect about Viruses?

Detailed Solution for Test: Virus - 1 - Question 9

. Viruses did not find a place in classification since they are not considered truly ‘living’, if we understand living as those organisms that have a cell structure. The viruses are non-cellular organisms that are characterised by having an inert crystalline structure outside the living cell. W.M. Stanley (1935) showed that viruses could be crystallised and crystals consist largely of proteins. They are inert outside their specific host cell. Viruses are obligate parasites.

Topic in NCERT: VIRUSES, VIROIDS, PRIONS AND LICHENS

Line in NCERT: "Viruses did not find a place in classification since they are not considered truly ‘living', if we understand living as those organisms that have a cell structure."

Test: Virus - 1 - Question 10

Which scientist demonstrated that viruses could be crystallized and that these crystals consisted largely of proteins?

Detailed Solution for Test: Virus - 1 - Question 10

W.M. Stanley demonstrated that viruses could be crystallized, with these crystals primarily consisting of proteins. This groundbreaking discovery provided insights into the structural composition of viruses and their behavior outside their specific host cells. Stanley's work significantly contributed to the understanding of viruses as obligate parasites and highlighted the importance of their proteinaceous nature in their biological activities.

Topic in NCERT: VIRUSES, VIROIDS, PRIONS AND LICHENS

Line in NCERT: "W.M. Stanley (1935) showed that viruses could be crystallised and crystals consist largely of proteins."

Test: Virus - 1 - Question 11

What distinguishes viroids from viruses?

Detailed Solution for Test: Virus - 1 - Question 11

 In 1971, T.O. Diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. It was found to be a free RNA; it lacked the protein coat that is found in viruses, hence the name viroid. The RNA of the viroid was of low molecular weight.

Topic in NCERT: Viroids

Line in NCERT: "It was found to be a free RNA; it lacked the protein coat that is found in viruses, hence the name viroid."

Test: Virus - 1 - Question 12

Match the Scientists in Column I with their contribution in the field of virology given in Column II and select your answer from the codes given below:

  

 

Detailed Solution for Test: Virus - 1 - Question 12

 

Ivanowsky - Recognized tobacco mosaic is caused by microbes smaller than bacteria

 

Beijerinek- Demonstrated extract of infected tobacco plants could cause infection in healthy plants

Stanley- Showed that viruses could be crystallized

so answer (A)

Test: Virus - 1 - Question 13

Assertion [A] Viruses are considered to be at the borderline of living and non-living things.

Reason [R] Viruses cannot survive outside the host organism.

Detailed Solution for Test: Virus - 1 - Question 13

The correct option is C

Assertion [A] is True and Reason [R] is True and is a correct explanation for [A].

 

Viruses are very small organisms which contain genetic material (DNA or RNA) and a protein coat covering it. A cellular structure is absent. Therefore viruses depend on the host for their survival. Viruses cannot survive outside the host. They can also be crystallised, which is a property of non-living things. This is the reason why they are considered to be at the borderline of living and non-living things.

Topic in NCERT: VIRUSES, VIROIDS, PRIONS AND LICHENS

Line in NCERT: "Viruses are non-cellular organisms that are characterised by having an inert crystalline structure outside the living cell."

Test: Virus - 1 - Question 14

Which type of viruses usually infect bacteria?

Detailed Solution for Test: Virus - 1 - Question 14

Bacterial viruses or bacteriophages (viruses that infect the bacteria) are usually double stranded DNA viruses

Topic in NCERT: Bacterial Viruses or Bacteriophages

Line in NCERT: "Bacterial viruses or bacteriophages (viruses that infect the bacteria) are usually double stranded DNA viruses."

Test: Virus - 1 - Question 15

The protein coat of the virus is called:

Detailed Solution for Test: Virus - 1 - Question 15

The protein coat  of virus is called capsid made of small subunits called capsomeres, protects the nucleic acid. These capsomeres are arranged in helical or polyhedral geometric forms. 

Topic in NCERT: Viruses

Line in NCERT: "The protein coat called capsid made of small subunits called capsomeres, protects the nucleic acid."

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