Which of the following could have an effect on the expression of a gene? a. the concentration of the end product of a metabolic pathway within a cell b. the number of mrna transcripts that are produced c. the rate at which ribosomes attach to mrna to begin translation d. all of these

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. once a virus gains entry into the body, it invades a host cell in order to? a. synthesize antibodies for defense b. deactivate the host cell's defenses c. access cell processes for reproduction d. metabolize host proteins and grow