Review questions, Oct 4

 

1.      Which of the followings could be a coenzyme ?

a.      zinc

b.      protein

c.      vitamin

d.      lipid

e.      ribosome

 

2.      Which of the following statements about inhibitors is NOT true?  Choose e if all statements are correct.

a.      The action of competitive inhibitor may be reversible or irreversible.

b.      If the binding of a inhibitor is reversible, the inhibitory effect may be overcome by adding an excess of substrates.

c.      A non-competitive inhibitor binds to the enzyme outside of the active site.

d.      A non-competitive inhibitor does not change the shape of the active site.

e.      All of the above are correct.

3.      Which of the following best describes the general structure of a cell membrane?

a.      proteins sandwiched between two layers of phospholipid

b.      proteins embedded in two layers of phospholipid

c.      a layer of protein coating a layer of phospholipid

d.      phospholipids sandwiched between two layers of protein

e.      phospholipids embedded in two layers of protein

 

4.      Cells A and B are the same size and shape, but cell A is metabolically quiet and cell B is actively consuming oxygen. Oxygen will diffuse more quickly into cell ___ because _____________.

a.      A ... the diffusion gradient there is shallower.

b.      A ... its membrane transport proteins will not be saturated.

c.      B ... the diffusion gradient there is steeper.

d.      B ... the oxygen molecules inside cell B have a higher kinetic energy.

e.      A ... it needs the oxygen in order to revive.

 

 

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