Question

- WERS ON THE SCANTRON SHEET PROVIDE 1. Viruses are known as obligate, intracellular A) Organisms B) Symbionts C) Ornelles D) Pass 2. Which of the following is a property of life shared by pokaryote ndaryote A) nucleic acids used to store hereditary information B) the capacity to evolve C) the ability to replicate (reproduce) without invading a host cell D) presence of proteins E) the capacity to mutate , NOV 3. Which of the following is characteristic of the phage lytie eyelet A) Many bacterial cells containing viral DNA are produced B) Viral DNA is incorporated into the host genome C) The viral genome replicates without destroying the host D) The virus-host relationship usually lasts for generations B) A large number of progeny phages are released at a time and the host cell is destroyed. 4. What is the function of reverse transcriptase in retrovires such as HIV? A) It uses viral RNA as a template for DNA synthesis B) li hydrolyzes or breaks down the host cell's DNA C) It converts host cell RNA into viral DNA. D) It uses viral RNA as a template for making complementary RNA strands E) It translates viral RNA into proteins. 5. A protective coat of proteins called an) which is made of subunits called the nucleic acid of genomes of viruses. A) envelope, capsids B) envelope, capsomeres C) capsid, capsomeres D) capsid, cores E) prion, capsids 6. Why does the HIV virus attack only a certain type of white blood cell die. T cells), and not other cell types'? A) Reverse transcriptase cannot transcribe RNA to DNA. B) Viral mRNA cannot be transcribed from the integrated provirus. C) HIV membrane receptors are not found on the other cell types. D) Viruses cannot bud from the host cell. 7. Which type of "live" vaccine uses a weakened form of a virus that causes disease? A) Inactivated vaccine B) Toxoid vaccine C) Wild-type vaccine D) Attenuated vaccine 8. Why is the antiviral drug AZT effective against HIV? A) It prevents the uncoating of the virus. B) It prevents the RNA from being reverse transcribed into DNA. C) It prevents the budding of the virus from infected host cells. D) It prevents the virus from binding to the CD4 receptor on the surface of the host cell. 9. Which of the following can be effective in preventing the onset of viral infection in humans? A) applying antiseptics B) getting vaccinated C) taking antibiotics D taking vitamins

Answer 1

Question

1. Viruses are obligates intracellular parasites. Hence, option d is correct.

2. Viruses cannot survive without host. Hence, option c is correct.

3. During lytic cycle, many copies of virus are produced and lead to the death of host cell. Hence, option e is correct.

4. Reverse transcriptase is an enzyme use for synthesis of DNA using RNA as template. Hence, option a is correct.

5. A protective coat of virus is known as capsid that is made up of units known as capsomeres. Hence, option c is correct.

7. Atteunated are vaccine made by reducing virulance of pathogen. Hence, option d is correct.

8. Antiviral drug AZT work by inhibition of activity of reverse transcriptase. Hence, option b is correct.

9. Getting vaccination help. Hence, option b is correct.