Unit 3 MindTaps

Question 1

T/F - The activity of an enzyme depends on its structure

Answer 1

True

Question 2

What factors can influence the structure of an enzyme?

Answer 2

Temperature, pH, and salt concentration.

Question 3

What impact does pH have on enzyme activity?

Answer 3

pH can impact the secondary structure of enzymes as well as affect the enzyme’s acitivity.

Question 4

The functional group of the amino acid histidine has a pKa of approximately 6.0. What would you expect would be true of a histidine residue in an enzyme in a solution with pH 4.0?

Answer 4

The functional group would tend to be protonated.

Question 5

If the pH of a solution is _____ than the pKa of a functional group, the functional group tends to donate protons.

Answer 5

greater

Question 6

Imagine an extreme thermophile, an organism thrives in an environment with a temperature higher than 40 C. What would you expect to observe about the enzymes found in the cells of that organism?

Answer 6

The enzymes would not function as well as enzymes from nonthermophilic organisms in lower temperatures.

The enzymes would have a higher optimal temperature than enzymes from nonthermophilic organisms.

Question 7

Which type of receptor is commonly found in neurons?

Answer 7

Ion channel–linked receptor

Question 8

Which of the following is NOT true of receptor proteins?

Answer 8

All receptor proteins have an extracellular domain.

Question 9

When can a G protein-linked receptor interact with G proteins?

Answer 9

When it is bound to a signaling molecule

Question 10

___ receptor proteins contain domains that catalyze chemical reactions inside the cell in response to ___

Answer 10

Enzyme-linked, signaling molecules

Question 11

Which receptor mediates fruit ripening?

Answer 11

Enzyme-linked