Which of the following is a characteristic by which viruses are classified?
A. type of nucleic acid
B. type of life cycle
C. number of chromosomes
D. type of host
E. size
Answer: A
You might also like to view...
During which stage(s) of human development are all major organs formed?
a. embryonic, fetal, and postnatal periods b. fetal period only c. embryonic period only d. both the embryonic and the fetal periods
What vital element missing from the atmosphere affected the type of life cells first formed on Earth?
a. Ammonia b. Carbon dioxide c. Oxygen d. Nitrogen
When macrophages bind antigens, they secrete
____ to attract more phagocytic cells.
a. more antigens b. MHC c. cytokines d. antibodies e. complement
Which of the following bacteria are associated with enterotoxins?
A. Clostridium botulinum B. Clostridium tetani C. Neither Clostridium tetani nor Clostridium botulinum D. Both Clostridium tetani and Clostridium botulinum