Structure of Virus

Q.

What is the morphology of viruses?

Q. An antiviral substance produced in response to viral infection to restrict its multiplication is

Q.

What are the non-living properties of viruses?

Q. Who was the first scientist to crystallise a virus?

1. Pasteur
2. Beijerinck
3. Stanley
4. Ivanowsky

Q. Viruses have

1. Single chromosome
2. DNA enclosed in a protein coat
3. Prokaryotic nucleus
4. Both DNA and RNA

Q.

What are capsomeres?

Q.

Are viruses prokaryotes?

Q.

Is yeast a prokaryote?

Q. In the E. coli cloning vector pBR 322, the number of selectable marker is

1. 1
2. 4
3. 3
4. 2

Q.

Why are viruses not classified into one of the three domains?

Q. Name the cells HIV (Human Immunodeficiency Virus) gains entry into after infecting the human body. Explain the events that occur in these cells. [2]

Q. The subunit of the protein coat of a virus is called

1. core
2. nucleotide
3. amino acid
4. capsomere

Q.

Who coined the term virus?

Q.

What is the difference between DNA and RNA virus?

Q. Circular DNA is found in

1. Bacteria, chloroplasts and mitochondria
2. All of the above
3. Chloroplasts and mitochondria alone
4. Viruses

Q.

AIDS is caused by HIV that principally infects

1. lymphocyte

2. cytotoxic T-cells

3. activator B-cells

4. All lymphocytes

Q.

What is a virus?

Q.

Do viruses have mitochondria?

Q. Name the group of cells the HIV enters after getting into the human body. What happens in these cells and what are these cells subsequently referred to as? Name the next group of cells the HIV attacks from here. [2]

Q.

In Hershey and Chase experiments, radioactive ³²P was used to culture bacteriophageswhich resulted in radioactive

1. Viral DNA

2. Bacterial capsule

3. Protein capsule of bacteriophage

4. Viral proteins

Q.

Are viruses, viroids, and prions living?

Q.

Give an example of a bacteriophage that is lysogenic.

Q.

Virus envelope is known as ______

Q. Select the incorrect match with respect to genetic material.

1. $\begin{array}{ccc}\text{Bacteriophage}& -& \text{dsDNA}\end{array}$
2. $\begin{array}{ccc}\text{Herpes virus}& -& \text{ssDNA}\end{array}$
3. $\begin{array}{ccc}\text{Influenza virus}& -& \text{ssRNA}\end{array}$
4. $\begin{array}{ccc}\text{TMV}& -& \text{ssRNA}\end{array}$

Q. Some foreign DNA fragment is attached to Cla I site of pBR 322. This recombinant vector is used to transform Escherichia coli. Then on two different media, one containing ampicillin and the other containing tetracycline. The transformed cells containing the recombinant vector will

1. Grow on both, tetracycline and ampicillin containing media
2. Grow on ampicillin but not on tetracycline containing medium
3. Grow on tetracycline but not on ampicillin containing medium
4. Not grow on either tetracycline containing or ampicillin containing media

Q. Who proved that DNA is basic genetic material?

1. Watson
2. Boveri and Sutton
3. Hershey and Chase
4. Griffith/Avery et al

Q.

What are the 3 types of capsids?

Q. Which of the following statements regarding viruses are correct?
(i) These are cellular, infectious, nucleoprotein particles
(ii) Genetic material is either DNA or RNA, but never both
(iii) Virus are obligate intracellular parasite

1. (i), (ii) and (iii)
2. only (ii)
3. (i) and (iii)
4. (ii) and (iii)

Q.

Why do viruses evolve quickly?

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

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