Ch. 7 Quiz

Question 1

Singer and Nicolson’s fluid mosaic model of the membrane proposed that…

Answer 1

Membranes consist of protein molecules embedded in a fluid bilayer of phospholipids

Question 2

An animal cell membrane will be more fluid at room temperature if it contains…

Answer 2

More cis-unsaturated and polyunsaturated fatty acids

Question 3

Which of these processes can move a solute against its concentration gradient?

Answer 3

Active transport

Question 4

An animal cell lacking oligosaccharides on the external surface of its plasma membrane would likely be impaired in which function?

Answer 4

Cell-cell recognition

Question 5

Which of the following proteins is not necessarily associated with the plasma membrane?

A) recognition protein
B) plasma protein
C) receptor protein
D) channel protein

Answer 5

Plasma protein

Question 6

Which of the following affects the rate of diffusion through a selectively permeable membrane?

I. concentration gradient
II. temperature
III. molecular size

A) I only
B) II only
C) I and II
D) I, II and III

Answer 6

I, II, and III

Question 7

The movement of potassium into an animal cell requires

Answer 7

An energy source such as ATP

Question 8

Which of the following molecules will diffuse most quickly across a lipid bilayer membrane?

A)H20
B) O2
C) H2PO4-
D) glucose
E) Na+

Answer 8

O2

Question 9

When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur?

Answer 9

The cell will become turgid