$$ \Delta C = [C]_\text{outside} - [C]_\text{inside} $$

Question 1

Which cellular structure is primarily responsible for controlling the flow of materials into and out of the cell?

Accepted Answer

Plasma membrane

Question 2

Which of the following is NOT one of the six primary functions of membrane proteins?

Accepted Answer

Energy production

Question 3

Transport proteins assist in moving materials across the cell membrane by:

Accepted Answer

Providing channels or carriers for specific molecules

Question 4

Which process requires energy input from the cell to move substances against their concentration gradient?

Accepted Answer

Active transport

Question 5

What is the main difference between passive transport and active transport?

Accepted Answer

Passive transport relies on the concentration gradient, while active transport requires energy input (usually ATP).

Question 6

Which equation best represents the driving force for passive transport?

Accepted Answer

$$ \Delta C = [C]_	ext{outside} - [C]_	ext{inside} $$

Question 7

Osmosis is best described as:

Accepted Answer

The movement of water molecules across a selectively permeable membrane from an area of low solute concentration to high solute concentration

Question 8

Which of the following statements about diffusion and osmosis is correct?

Accepted Answer

Diffusion can occur with or without a membrane, but osmosis requires a selectively permeable membrane.

Question 9

What happens to an animal cell placed in a hypertonic solution?

Accepted Answer

It shrivels as water leaves the cell.

Question 10

A plant cell placed in a hypotonic solution will:

Accepted Answer

Become turgid as water enters the cell.

Question 11

Which process is used by cells to move large molecules, such as proteins, out of the cell?

Accepted Answer

Exocytosis

Question 12

Which of the following is NOT a step in the signal transduction pathway?

Accepted Answer

Replication

Question 13

A patient receives an intravenous solution that is hypotonic compared to their blood plasma. What is the most likely effect on their red blood cells?

Accepted Answer

Cells will swell and may burst due to water influx.

Question 14

Which type of membrane protein is directly involved in cell-cell recognition?

Accepted Answer

Glycoproteins

Question 15

Facilitated diffusion differs from simple diffusion in that:

Accepted Answer

Facilitated diffusion requires membrane proteins to assist the movement of molecules.

Question 16

Which equation best describes the movement of water during osmosis?

Accepted Answer

$$ \Psi = \Psi_s + \Psi_p $$

Question 17

Which process allows cells to engulf large particles, such as bacteria, by surrounding them with the plasma membrane?

Accepted Answer

Phagocytosis

Question 18

A plant cell placed in a hypertonic solution will:

Accepted Answer

Become plasmolyzed as water leaves the cell.

Question 19

Which of the following is a real-life example of active transport in human physiology?

Accepted Answer

Sodium-potassium pump maintaining ion gradients across nerve cell membranes

Question 20

During signal transduction, what typically happens during the 'transduction' step?

Accepted Answer

A series of molecular events relays and amplifies the signal inside the cell.

Cell Membranes: Structure, Transport, and Signaling

Study Guide - Practice Questions