Deck 39: Digestive System Processes: Chemical and Physical

Question 1

The end products of digestion of carbohydrates are .

A) amino acids
B) monosaccharides
C) disaccharides
D) oligosaccharides

Answer 1

B

Question 2

Which type of movement in the GI system propels food along the entire alimentary canal?

A) segmentation
B) peristalsis
C) defecation
D) swallowing

Answer 2

B

Question 3

This fat-digesting enzyme does the major work of digesting fats in the small intestine.

A) ribonuclease
B) pepsin
C) lipase
D) amylase

Answer 3

C

Question 4

The digestive enzymes tested in the laboratory function best at this temperature.

A) 98°C
B) 0°C
C) 50°C
D) 37°C

Question 5

When proteins are digested, the following molecules can be absorbed: .

A) tripeptides
B) dipeptides
C) amino acids, dipeptides, and tripeptides
D) amino acids

Question 6

Which of the following enzymes digests carbohydrates?

A) amylase
B) lactase
C) amylase, lactase, and sucrase
D) sucrase

Question 7

Fats, in the presence of litmus (that indicates pH of the solution), are shown to be digested .

A) when the solution in the test tube turns blue (alkaline)
B) when the solution in the test tube turns yellow (neutral)
C) when the solution in the test tube turns pink (acidic)

Question 8

This enzyme, produced by the salivary glands, digests carbohydrates.

A) oligosaccharidase
B) amylase
C) sucrase
D) glucoamylase

Question 9

Bile .

A) is an important catalyst for lipid hydrolysis
B) emulsifies fat, keeping tiny fat droplets suspended in the aqueous contents of the gut
C) is a digestive enzyme that hydrolyzes lipids
D) is a digestive enzyme that hydrolyzes lipids, is an important catalyst for lipid hydrolysis, and emulsifies fat, keeping tiny fat droplets suspended in the aqueous contents of the gut

Question 10

Amylase and starch are mixed and placed at 0°C. After the IKI test, the solution turns black. A Benedict's test yields a negative result. Was starch digested? How do you know?

A) No, the Benedict's test revealed no sugars in solution.
B) Yes, the starch test indicated that no starch remained, and the Benedict's test revealed the presence of sugars in solution.
C) Some was digested; the starch test showed some starch and the Benedict's test showed some sugars.

Question 11

In the laboratory assay on digestion of the protein BAPNA by trypsin, what was the purpose of including a tube with trypsin alone?

A) to indicate that trypsin did not contribute to the clear (positive) color
B) to indicate that BAPNA did not contribute to the yellow (positive) color
C) to indicate that trypsin did not contribute to the yellow (positive) color
D) to indicate that BAPNA did not contribute to the clear (positive) color

Question 12

This test detects starch in solution.

A) Benedict's test
B) IKI (Lugol's iodine) test
C) litmus test

Question 13

When carbohydrates are digested, the following molecules can be absorbed: .

A) disaccharides
B) monosaccharides, disaccharides, and small oligosaccharides
C) monosaccharides
D) small oligosaccharides

Question 14

In the assay in which fat was digested, is the substrate, and is the hydrolase.

A) BAPNA, trypsin
B) trypsin, BAPNA
C) lipase, cream
D) cream, lipase

Question 15

This protein-digesting enzyme works optimally at pH 1.5-2.0. What is the enzyme, and where is it produced?

A) trypsin; stomach
B) pepsin; stomach
C) trypsin; pancreas
D) pepsin; pancreas

Question 16

Digestive enzymes _.

A) control the movement of food from one digestive organ to the next
B) are biological catalysts
C) are produced only within the GI tract
D) break down substrates by dehydration

Question 17

The evidence that trypsin digested protein to amino acids is _.

A) the presence of a yellow color in the test tube
B) the presence of a pink color in the test tube
C) a negative starch test
D) a positive Benedict's test

Question 18

Which type of movement in the GI system is primarily responsible for moving chyme back and forth, mixing it with digestive juices and promoting the absorption of nutrients?

A) segmentation
B) swallowing
C) peristalsis
D) defecation

Question 19

The pancreas produces this protein-digesting enzyme.

A) trypsin
B) dipeptidase
C) enterokinase
D) pepsin

Question 20

Fat digestion results in .

A) monoglycerides and fatty acids
B) monoglycerides
C) fatty acids
D) glycerol

Question 21

Which of the following is not a protein digesting enzyme?

A) chymotrypsin
B) carboxypeptidase
C) nucleosidase
D) dipeptidase

Question 22

Peristaltic waves occur in all of the following organs except .

A) esophagus
B) stomach
C) small intestine
D) pharynx