How does testosterone cross the plasma membrane?
a. simple diffusion,
b. passive transport through a carrier protein,
c. active transport,
d. co-transport.

How do antiviral drugs work? in your own words.

Which of these has happened to your food by the time it reaches your small intestine? a. all the macromolecules have been broken down completely. b. lipids and starches have been partially broken down. c. starches and proteins have been partially broken down. d. proteins and lipids have been broken down into subunits.

What organs comprise the respiratory system of a bird