Question

BIO 202 QUIZ #1 1. Viruses are A Small infectious particles B. A simple structure. C. The core of either RNA or DNA. D. A variety of shapes: brick-like, helical, or polyhedral E. All of the above. 2. A typical virus has the following anatomical feature(s): A. Protein coat known as a capsomere. B. Core of either DNA or RNA. C. Capsomeres that constructed from protein subunits or capsids. D. Both A and C E. All of the above. 3. Which of the following are modes of transmission of viral diseases? A. Direct contact B. Airborne, as in coughing and sneezing. C. Sharing bodily fluids. D. Both b and C. E. All of the above. 4 Viriods A. Cause diseases in plants. B. consists of a strand of RNA only a few hundred bases in length C. Are transmitted in pollen grains or seeds via sucking insects, or in the process of pruning D. A and C only E. all of the above. 5 Which of the following is true? A. Viruses cannot reproduce outside a host cell. B. Prions are infectious proteins. C. Viroids lack a protein coat. D. Some viruses cause cancer. E. All of the above. 6. Viruses have a and a A. DNA core, carbohydrate coat. B. DNA or RNA core, plasma membrane. C. DNA or RNA core; protein coat. . RNA core, peptidoglycan coat. None of the above.

Answer 1

1. Viruses are small infectious particles made up of proteins and nucleic acid. Viruses exist in variety of shapes like helical, polyhedral etc.

hence the answer is E all of the above.

2. Capsid is a protein coat of viruses composed of sub units called capsomeres.

Core of viruses has RNA and DNA.

hence the answer is B

3. Viral diseases can be transmitted by direct contact (chicken pox), through air ( Influenza) and through body fluids (AIDS).

Hence the answer is E.

4. viroids are short strands of infectious RNA and cause diseases in plants. Viroids can be transmitted by seeds, pollen grains or via sucking insects like aphids.

Hence the answer is E

5. All are true E

6. viruses have DNA or RNA core and a protein coat.

Hence the answer is C