A. Enzymes are proteins. Give one example of a chemical that would be representative of both a cofactor and a coenzyme. Explain how heating inactivates enzymes. Distinguish between competitive inhibition and noncompetitive inhibition 35. Cite one example taken from the text.
Plasma membranes are selectively permeable.
The plasma membrane is the control center of the cell. The plasma membrane forms a selective barrier around the cell. The plasma membrane has receptors for receiving chemical messengers. The plasma membrane plays a role in signal transduction. Small, nonpolar, hydroophobic molecules such as fatty acids easily pass through a membrane's lipid bilayer.