Structure of Virus

Q.

What is the baltimore classification?

Q.

Why are viruses not included in the three-domain classification system?

Q. Which of these contain RNA as the genetic material?
(i) Lichens
(ii) Prions
(iii) Viroids
(iv) Viruses

1. i and ii
2. ii and iii
3. iii and iv
4. i and iv

Q. The capsid is made up of

1. lipids
2. proteins
3. polysaccharides
4. fatty acids

Q.

What are receptor sites in bacteriophages?

Q. Which of the following statements is not true for retroviruses?

1. Retroviruses carry gene for RNA dependent DNA polymerase
2. The genetic material in mature retroviruses is RNA
3. Retroviruses are causative agents for certain kinds of cancer in man
4. DNA is not present at any stage in the life cycle of retroviruses

Q.

Capsid and capsomeres are the terms used for the

1. Lipid coat and its subunits of a virus

2. Protein coat and its subunits of a virus

3. Stages during the multiplication of viruses

4. Single stranded RNA and its nucleotides of tobacco mosaic virus

Q. Plant viruses have as their genetic material.

1. RNA and DNA
2. RNA or DNA
3. Only RNA
4. Only DNA

Q. Virus envelope is known as

1. Capsid
2. Virion
3. Nucleoprotein
4. Core

Q.

A virus differs from a bacterium as it (virus) contains

1. A cell wall

2. Cytosol

3. DNA as genetic material

4. DNA or RNA as genetic material, and no ribosomes

Q. Which of the following shows coiled RNA strand and capsomeres ?

1. Polio virus
2. Tobacco mosaic virus
3. Measles virus
4. Retrovirus

Q. A common feature shared by animals, plants, bacteria and viroids is the presence of

1. RNA
2. DNA
3. proteins
4. cell wall

Q. The nucleic acid in viruses is surrounded by a covering made of

1. glycolipids
2. capsomeres
3. phospholipid
4. fimbriae

Q.

Regarding Assertion and Reason, select the option that is correct.

Assertion: Viruses are classified as living organism.

Reason: They have very simple, non-cellular structure and cannot exist independently.

1. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

2. Both Assertion and Reason are correct. But Reason is not the correct explanation of Assertion.

3. Both Assertion and Reasons are incorrect.

4. The Assertion is incorrect but Reason is correct.

Q.

Genetic material in viruses is:

1. RNA

2. DNA

3. Protein

4. Both a and b