Review questions, Oct 2

 

1.     ATP can be used as cell’s energy currency because

a.      ATP is most energy rich and small molecule in the cell.

b.     the regeneration of ATP from ADP can be fueled by coupling it with exergonic (energy generating) reactions.

c.     endergonic (energy requiring) reactions can be fueled  by coupling them with the formation of ATP from ADP.

d.     endergonic (energy requiring) reactions can be fueled by coupling them with the hydrolysis of the high-energy phosphate bonds in ATP.

 

 

 

2.     Which of the followings is NOT true?

a.      An enzyme’s function depends on its three-dimensional shape.

b.     Enzymes are very specific for certain substrates.

c.     Enzymes are used up in chemical reactions.

d.     Enzymes lower the energy of the activation of chemical reactions.

e.      An enzyme binds to its substrate at the enzyme’s active site.

 

 

 

3.     Which of the followings is the most likely optimal pH for digestive enzymes in stomach?

a.      pH 4

b.     pH 6

c.     pH 8

d.     pH 10