Which of the following is an example of active transport?
A. diffusion
B. moving molecules from an area of high to low
concentration
C. moving molecules against a concentration
gradient
D. moving molecules with the concentration
gradient

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