Q: Which equation best represents the direction of water flow during osmosis?

$$\text{Water moves from}~[\text{Low solute}]~\text{to}~[\text{High solute}]$$

Question 1

Which of the following best describes the fluid mosaic model of biological membranes?

Accepted Answer

A dynamic bilayer of phospholipids with embedded proteins and cholesterol.

Question 2

Which type of membrane protein spans the entire lipid bilayer and is involved in transport across the membrane?

Accepted Answer

Integral membrane protein

Question 3

A cell is placed in a solution with a higher solute concentration than its cytoplasm. What will happen to the cell?

Accepted Answer

It will shrink due to water efflux.

Question 4

Which of the following molecules can most easily diffuse across a biological membrane’s lipid bilayer without the help of a protein?

Accepted Answer

O\_2

Question 5

Which process involves the movement of water across a semi-permeable membrane from a region of low solute concentration to a region of high solute concentration?

Accepted Answer

Osmosis

Question 6

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

Accepted Answer

Making cells for respiration.

Question 7

A transporter protein that simultaneously transports two different molecules in opposite directions is called a:

Accepted Answer

Antipoter

Question 8

Which option below best describes a transporter that requires ATP to move molecules A and B out of the cell?

Accepted Answer

Active antiporter

Question 9

Which of the following statements about simple diffusion is correct?

Accepted Answer

It moves molecules down their concentration gradient.

Question 10

Which of the following best describes facilitated diffusion?

Accepted Answer

Non-energetic diffusion of charged molecules facilitated by a transport protein.

Question 11

Which equation best represents the direction of water flow during osmosis?

Accepted Answer

$$	ext{Water moves from}~[	ext{Low solute}]~	ext{to}~[	ext{High solute}]$$

Question 12

Which of the following is true regarding primary active transport?

Accepted Answer

It directly uses ATP hydrolysis to move molecules against their concentration gradient.

Question 13

The sodium-potassium pump moves:

Accepted Answer

3 Na\^+ out and 2 K\^+ in, using ATP.

Question 14

Secondary active transport is powered by:

Accepted Answer

The concentration gradient established by primary active transport.

Question 15

Which of the following processes is used by white blood cells to engulf bacteria?

Accepted Answer

Phagocytosis

Question 16

Which statement best describes exocytosis?

Accepted Answer

Fusion of vesicles with the cell membrane to release contents outside the cell.

Question 17

Which of the following is NOT a true statement regarding endocytosis?

Accepted Answer

It is used for secretion of hormones.

Question 18

Which of the following best describes the difference between simple and facilitated diffusion?

Accepted Answer

Facilitated diffusion requires a transport protein, while simple diffusion does not.

Question 19

Which of the following is a function of membrane proteins involved in cell signaling?

Accepted Answer

Acting as signal molecule receptors

Question 20

A plant cell is placed in a hypotonic solution. What is the expected outcome?

Accepted Answer

The cell will become turgid.

Cell Membrane Structure and Transport Mechanisms

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