$$\text{Net movement} = \text{Water moves from high concentration to low concentration across a selectively permeable membrane}$$

$$\Delta G = RT \ln \left( \frac{[C]_\text{inside}}{[C]_\text{outside}} \right) + zF\Delta V$$

Question 1

Which of the following best describes the function of the plasma membrane in a cell?

Accepted Answer

It acts as a physical barrier, regulates selective permeability, facilitates communication, and enables cell recognition.

Question 2

Which component of the plasma membrane is primarily responsible for its selective permeability?

Accepted Answer

Phospholipid bilayer

Question 3

A cell is placed in a hypertonic solution. What will happen to the cell?

Accepted Answer

The cell will lose water by osmosis and shrink.

Question 4

Which equation best represents the net movement of water during osmosis?

Accepted Answer

$$	ext{Net movement} = 	ext{Water moves from high concentration to low concentration across a selectively permeable membrane}$$

Question 5

Which cell junction is most important for preventing leakage of extracellular fluid between epithelial cells in the intestine?

Accepted Answer

Tight junctions

Question 6

Which of the following is NOT a passive transport process?

Accepted Answer

Primary active transport

Question 7

A red blood cell placed in a hypotonic solution will:

Accepted Answer

Swell and potentially burst (lyse) due to water influx

Question 8

Which of the following best describes the mechanism of primary active transport?

Accepted Answer

Energy from ATP changes the shape of a transporter protein, pumping substances against their concentration gradient.

Question 9

Which equation describes the electrochemical gradient across a membrane?

Accepted Answer

$$\Delta G = RT \ln \left( \frac{[C]_	ext{inside}}{[C]_	ext{outside}} ight) + zF\Delta V$$

Question 10

Which of the following is a function of the glycocalyx on the plasma membrane?

Accepted Answer

Allows cell recognition and immune response

Question 11

Which type of cell junction allows ions and small molecules to pass directly from one cell to another, and is especially important in heart cells?

Accepted Answer

Gap junctions

Question 12

Which process involves the movement of large particles, such as bacteria, into a cell by engulfment?

Accepted Answer

Phagocytosis

Question 13

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient via a protein carrier or channel

Question 14

Which equation best represents osmotic pressure?

Accepted Answer

$$\Pi = iMRT$$

Question 15

Which of the following is true about secondary active transport?

Accepted Answer

It uses energy stored in a concentration gradient to move other substances against their own gradient.

Question 16

Which process is used by cells to release substances, such as neurotransmitters, into the extracellular fluid?

Accepted Answer

Exocytosis

Question 17

Which of the following is a real-life example of receptor-mediated endocytosis?

Accepted Answer

Uptake of LDL cholesterol particles by cells

Question 18

Which of the following statements about the fluid mosaic model of the plasma membrane is correct?

Accepted Answer

Membrane lipids and proteins can move laterally within the bilayer.

Question 19

Which of the following is NOT a function of membrane proteins?

Accepted Answer

Formation of the basic membrane structure

Question 20

Which of the following best describes the direction of movement for substances in simple diffusion?

Accepted Answer

From high concentration to low concentration

Chapter 3: Cells – The Living Units (ANP College Study Guide)

Study Guide - Practice Questions