Deck 56: Action of a Digestive Enzyme

Question 1

Which of the following is not true of amylase?

A) It breaks down starch into maltose.
B) It is produced by more than one organ of the digestive system.
C) Its optimum temperature is close to room temperature.
D) The optimum pH for amylase activity is 6.8 - 7.0.
E) All of these are true of amylase.

Answer 1

C

Question 2

Temperatures much higher than the optimum temperature denature enzymes, but colder temperatures do not.

Answer 2

True

Question 3

Pancreatic amylase has the same action as salivary amylase.

Answer 3

True

Question 4

Which digestive organ produces the enzyme maltase?

A) Small intestine
B) Pancreas
C) Salivary glands
D) Stomach
E) Liver

Question 5

The substance that an enzyme acts on in a chemical reaction is called its

A) complex.
B) product.
C) modulator.
D) catalyst.
E) substrate.

Question 6

In the amylase activity experiment, Benedict's solution tests for the presence of

A) triglycerides.
B) amino acids.
C) protein.
D) maltose.
E) starch.

Question 7

When an enzyme catalyzes a chemical reaction, it is consumed in the process, so it cannot be used repeatedly.

Question 8

In the amylase activity experiment, the development of a blue-black color upon the addition of iodine-potassium-iodide to the test tube indicates that

A) the starch has been broken down.
B) the starch has been denatured.
C) amylase is functioning at its optimum temperature.
D) the starch has not been broken down.
E) glucose is present in the test tube.

Question 9

Which of the following is not true of enzymes?

A) They are considered to be biological catalysts.
B) Enzymes are relatively non-specific, and able to catalyze several chemical reactions in the body.
C) Enzyme activity is temperature-dependent.
D) Denaturation destroys the ability of an enzyme to function.
E) All of these are true of enzymes.

Question 10

Enzymes can be proteins, lipids, or carbohydrates.

Question 11

Denaturation does not alter the primary structure of an enzyme.

Question 12

All digestive enzymes have the same optimum pH ranges.

Question 13

Salivary amylase is deactivated by ________ in the stomach.

A) pepsinogen
B) bile
C) bicarbonate ions
D) lipase
E) hydrochloric acid