Question 1

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

Accepted Answer

A) True 
 B)False  True

Question 2

All digestive enzymes have the same optimum pH ranges.

Accepted Answer

A) True 
 B)False  False

Question 3

Which digestive organ produces the enzyme maltase?

Accepted Answer

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

Question 4

Denaturation does not alter the primary structure of an enzyme.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is not true of enzymes?

Accepted Answer

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. 
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 6

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

Accepted Answer

A) True 
 B)False

Question 7

Enzymes can be proteins, lipids, or carbohydrates.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following is not true of amylase?

Accepted Answer

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. 
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.

Question 9

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

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

Pancreatic amylase has the same action as salivary amylase.

Accepted Answer

A) True 
 B)False

Question 12

Salivary amylase is deactivated by ________ in the stomach.

Accepted Answer

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

Question 13

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

Accepted Answer

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. 
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.

Exam 56: Action of a Digestive Enzyme

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

All digestive enzymes have the same optimum pH ranges.

Which digestive organ produces the enzyme maltase?

Denaturation does not alter the primary structure of an enzyme.

Which of the following is not true of enzymes?

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

Enzymes can be proteins, lipids, or carbohydrates.

Which of the following is not true of amylase?

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

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

Pancreatic amylase has the same action as salivary amylase.

Salivary amylase is deactivated by ________ in the stomach.

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

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