Question 1

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

Accepted Answer

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) D) B) and C)
E) A) and B) C

Question 2

Digestive enzymes _.

Accepted Answer

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 dehydrationE) A) and D)
F) B) and D)

Question 3

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?

Accepted Answer

A)   segmentation
B)   swallowing
C)   peristalsis
D)   defecationE) None of the above
F) All of the above

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

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)  colorE) None of the above
F) B) and C)

Question 6

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

Accepted Answer

A)   segmentation
B)   peristalsis
C)   defecation
D)   swallowingE) B) and C)
F) A) and D)

Question 7

Bile .

Accepted Answer

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 gutE) C) and D)
F) A) and C)

Question 8

Which of the following is not a protein digesting enzyme?

Accepted Answer

A)   chymotrypsin
B)   carboxypeptidase
C)   nucleosidase
D)   dipeptidaseE) A) and B)
F) B) and C)

Question 9

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

Accepted Answer

A)   98°C
B)   0°C
C)   50°C
D)   37°CE) All of the above
F) None of the above

Question 10

The end products of digestion of carbohydrates are .

Accepted Answer

A)   amino acids
B)   monosaccharides
C)   disaccharides
D)   oligosaccharidesE) A) and D)
F) All of the above

Question 11

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

Accepted Answer

A)   ribonuclease
B)   pepsin
C)   lipase
D)   amylaseE) All of the above
F) C) and D)

Question 12

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

Accepted Answer

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

Question 13

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?

Accepted Answer

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.D) None of the above
E) A) and B)

Question 14

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

Accepted Answer

A)   oligosaccharidase
B)   amylase
C)   sucrase
D)   glucoamylaseE) A) and D)
F) All of the above

Question 15

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

Accepted Answer

A)   trypsin; stomach
B)   pepsin; stomach
C)   trypsin; pancreas
D)   pepsin; pancreasE) A) and D)
F) A) and C)

Question 16

The pancreas produces this protein-digesting enzyme.

Accepted Answer

A)   trypsin
B)   dipeptidase
C)   enterokinase
D)   pepsinE) B) and C)
F) A) and D)

Question 17

This test detects starch in solution.

Accepted Answer

A)   Benedict's test
B)   IKI (Lugol's iodine)  test
C)   litmus testD) A) and B)
E) All of the above

Question 18

Which of the following enzymes digests carbohydrates?

Accepted Answer

A)   amylase
B)   lactase
C)   amylase, lactase, and sucrase
D)   sucraseE) All of the above
F) A) and D) C

Question 19

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

Accepted Answer

A)   BAPNA, trypsin
B)   trypsin, BAPNA
C)   lipase, cream
D)   cream, lipaseE) All of the above
F) B) and C)

Question 20

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

Accepted Answer

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 testE) A) and B)
F) B) and C) A

Exam 39: Digestive System Processes: Chemical and Physical

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

Correct AnswerverifiedC

Digestive enzymes _.

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Bile .

Correct AnswerverifiedShow Answer

Which of the following is not a protein digesting enzyme?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The end products of digestion of carbohydrates are .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The pancreas produces this protein-digesting enzyme.

Correct AnswerverifiedShow Answer

This test detects starch in solution.

Correct AnswerverifiedShow Answer

Which of the following enzymes digests carbohydrates?

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified
A