Q: Which equation best describes the direction of water movement during osmosis across a selectively permeable membrane?

$$\text{Water moves from a region of lower solute concentration to higher solute concentration}$$

Q: Which equation represents the phosphorylation of a protein by ATP during active transport?

$$\text{Protein} + \text{ATP} \rightarrow \text{Protein-Phosphate} + \text{ADP}$$

Question 1

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

Accepted Answer

The membrane consists of a phospholipid bilayer with proteins and other molecules embedded, allowing lateral movement.

Question 2

A cell is placed in a solution and water moves into the cell, causing it to swell. Which type of solution is the cell in?

Accepted Answer

Hypotonic

Question 3

Which of the following statements about cholesterol in the plasma membrane is correct?

Accepted Answer

Cholesterol helps prevent the membrane from becoming too solid at low temperatures and restrains movement at high temperatures.

Question 4

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

Accepted Answer

Energy storage

Question 5

A researcher observes that a membrane protein is attached to microfilaments of the cytoskeleton and to the extracellular matrix. Which type of protein is this?

Accepted Answer

Integral membrane protein

Question 6

Which of the following molecules would most easily cross a pure phospholipid bilayer without the aid of a transport protein?

Accepted Answer

O	extsubscript{2}

Question 7

Which equation best describes the direction of water movement during osmosis across a selectively permeable membrane?

Accepted Answer

$$	ext{Water moves from a region of lower solute concentration to higher solute concentration}$$

Question 8

A cell maintains a high concentration of K	extsuperscript{+} inside and a high concentration of Na	extsuperscript{+} outside. Which process is responsible for this distribution?

Accepted Answer

Active transport via the sodium-potassium pump

Question 9

Which of the following best explains why the sodium-potassium pump requires energy?

Accepted Answer

It moves solutes against their concentration gradients.

Question 10

Which of the following is true about facilitated diffusion?

Accepted Answer

It uses membrane proteins to move molecules down their concentration gradient.

Question 11

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

Accepted Answer

It will become plasmolyzed.

Question 12

Which of the following is a correct description of peripheral membrane proteins?

Accepted Answer

They are bound to molecules within the bilayer but not embedded in it.

Question 13

Which of the following is an example of co-transport in cell membranes?

Accepted Answer

The use of a proton gradient to drive the uptake of sucrose into the cell.

Question 14

Which of the following best describes the role of membrane carbohydrates?

Accepted Answer

They are involved in cell-cell recognition and immune response.

Question 15

Which of the following blood types is determined by the presence of both A and B carbohydrates on glycoproteins?

Accepted Answer

Type AB

Question 16

Which of the following processes requires energy input from ATP?

Accepted Answer

Active transport

Question 17

Which equation represents the phosphorylation of a protein by ATP during active transport?

Accepted Answer

$$	ext{Protein} + 	ext{ATP} ightarrow 	ext{Protein-Phosphate} + 	ext{ADP}$$

Question 18

Which of the following is true about exocytosis?

Accepted Answer

It involves vesicles fusing with the plasma membrane to secrete macromolecules.

Question 19

Which of the following best explains why arctic char have more cholesterol in their cell membranes than warm water fish?

Accepted Answer

Cholesterol increases membrane fluidity at low temperatures, preventing the membrane from becoming too rigid.

Question 20

Which of the following is NOT a component of the plasma membrane?

Accepted Answer

Nucleic acids

Membrane Structure and Function: Study Notes for Cell Biology

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