Deck 19: Digestive Enzymes

Question 1

Trypsinogen, chymotrypsinogen, proelastase, procarboxypeptidases, and prophospholipases are all produced as inactive zymogens.Each of these zymogens can be activated by the enzyme ________, and this normally occurs in ________.

A)Enteropeptidase; the duodenal epithelium.
B)Enteropeptidase; the intestinal lumen.
C)Pepsin; the stomach.
D)Chymotrypsin; the pancreas.
E)Trypsin; the intestinal lumen.

Answer 1

Trypsin; the intestinal lumen.

Question 2

Lactose intolerance is not only a commonly encountered genetic trait but can also be caused by diseases that compromise the function of the intestinal epithelium.After lactose ingestion, lactose-intolerant individuals most likely have:

A)Absorption of intact lactose from the intestine, followed by cleavage of the lactose by endothelial lactase in most tissues.
B)Excessive formation of ammonia within 2 hours after lactose ingestion, which can be dangerous for patients with liver cirrhosis.
C)Fatty stools, because unabsorbed lactose is fermented into fatty acids by intestinal bacteria.
D)Absence of reducing substances from the stools.
E)A pH of the stools in the acidic range.

Answer 2

A pH of the stools in the acidic range.

Question 3

The bacterial fermentation of undigested carbohydrates in the colon forms not only gas but also a good deal of:

A)Lactose.
B)Fatty acids.
C)Small organic acids.
D)Urea.
E)Ketone bodies.

Answer 3

Small organic acids.