$$ \text{Water moves from an area of low solute concentration to high solute concentration} $$

Question 1

Which of the following best describes the fluid mosaic model of the plasma membrane?

Accepted Answer

A dynamic structure with proteins and lipids that can move laterally within the bilayer.

Question 2

Phospholipids are described as amphipathic molecules. What does this mean?

Accepted Answer

They contain both hydrophobic and hydrophilic regions.

Question 3

Which of the following changes would increase membrane fluidity at low temperatures?

Accepted Answer

Adding more cholesterol to the membrane.

Question 4

Integral membrane proteins differ from peripheral membrane proteins in that integral proteins:

Accepted Answer

Are embedded within the lipid bilayer and often span the membrane.

Question 5

Which of the following is a function of membrane carbohydrates?

Accepted Answer

Enabling cell-cell recognition.

Question 6

A red blood cell placed in a hypotonic solution will:

Accepted Answer

Burst as water enters the cell.

Question 7

Which of the following best describes facilitated diffusion?

Accepted Answer

Passive movement of molecules down their concentration gradient via transport proteins.

Question 8

The sodium-potassium pump is an example of:

Accepted Answer

Active transport using carrier proteins and ATP.

Question 9

Which of the following equations correctly represents the movement of water during osmosis?

Accepted Answer

$$ 	ext{Water moves from an area of low solute concentration to high solute concentration} $$

Question 10

In the beaker experiment (see image 3), which direction will water move?

Accepted Answer

Water will move out of the cell because the cell has a higher total solute concentration.

Question 11

Which of the following is NOT a type of bulk transport?

Accepted Answer

Facilitated diffusion

Question 12

What is the main difference between channel proteins and carrier proteins?

Accepted Answer

Channel proteins form hydrophilic tunnels, while carrier proteins undergo conformational changes to move molecules.

Question 13

Which of the following best describes cotransport?

Accepted Answer

The coupling of the downhill diffusion of one substance to the uphill transport of another.

Question 14

Which of the following statements about membrane potential is correct?

Accepted Answer

Membrane potential is created by the unequal distribution of ions across the membrane.

Question 15

Which process is illustrated by the movement of glucose into a cell via a specific protein, without energy input?

Accepted Answer

Facilitated diffusion

Question 16

A plant cell in a hypertonic solution will:

Accepted Answer

Undergo plasmolysis as the plasma membrane pulls away from the cell wall.

Question 17

Which of the following is a key feature of receptor-mediated endocytosis?

Accepted Answer

It allows the cell to selectively take in specific molecules based on receptor binding.

Question 18

Which of the following best explains why plant cells do not burst in hypotonic solutions, but animal cells do?

Accepted Answer

Plant cells have a rigid cell wall that prevents excessive expansion.

Question 19

Which of the following is true regarding the sodium-potassium pump?

Accepted Answer

It moves 3 sodium ions out and 2 potassium ions into the cell per ATP hydrolyzed.

Question 20

Which of the following best describes selective permeability?

Accepted Answer

The membrane allows some substances to cross more easily than others.

Membrane Structure and Function: Study Guide

Study Guide - Practice Questions