A. How will you define the word “virus”?
B. Write any five distinguishing features of viruses.
C. Write any five characteristics on the basis of which viruses can be differentiated from bacteria.
D. Do the viruses possess a cellular organization?
E. Do the viruses contain both types of nucleic acids?
F. Do the viruses also multiply by binary fi ssion like bacteria?
G. Which of the following diseases are caused by viruses?
(a) Small pox and mumps, (b) Rabies and measles,
(c) Herpes and common cold, (d) All of these.
H. Who was the first to isolate a virus in a crystalline form?
I. Viroids and prions were discovered by whom and when?