Why do the cells of the digestive system secrete
proteolytic enzymes, such as pepsin, in their inactive
forms?
A) These proteolytic enzymes, in active form, would digest the
very tissues that synthesize them.
B) By secreting inactive enzymes, the catalytic activity of the
enzymes is maintained for a longer time.
C) The stomach is too acidic to maintain these enzymes in their
active form.
D) Inactive pepsin and trypsin are more easily transported
across the cell membrane
Over-the-counter medications for acid reflux or
heartburn block the production of stomach acid. Which of the
following cells are directly affected by this
medication?
A) goblet cells
B) chief cells
C) parietal cells
D) smooth muscle cells
The digestion of fats differs from that of
carbohydrates in that ________.
A) Fat digestion needs bile from the liver while carbohydrate
does not
B) Carbohydrates need to be emulsified before they can be
digested, whereas fats do not
C) Fat digestion occur in large intestine
D) Fats, but not carbohydrates, are digested by bacteria before
absorption
Constipation can result from the consumption of a
substance that ________.
A) promotes water reabsorption in the large intestine
B) speeds up movement of material in the large intestine
C) decreases water reabsorption in the small intestine
D) stimulates peristalsis
If you place a small piece of a cracker on your tongue,
what would you expect to happen?
A) The vitamins in the cracker are immediately absorbed.
B) Degradation of the starch from the cracker into glucose.
C) The proteins in the cracker begin to be digested.
D) The flavor becomes less noticeable because the sugars are
digested.