Which of the following is true of an enzyme? a. it catalyzes a series of reactions b. it breaks down immediately following the reaction it catalyzes c. it changes the amount of energy released at the end of a reaction d. it binds a single set of substrates

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.