How many nitrogen bases make up a codon and what does it represent?

What is the role of the phospholipid belayer in cellular transport in living cells

What is a group of organisms that are closely related and share similar characteristics

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