Q: Which equation represents the energy requirement for active transport?

$ \text{ATP} \rightarrow \text{ADP} + \text{P} $

Q: Which equation best represents the net movement of water in an isotonic solution?

$ \text{Water}_{in} = \text{Water}_{out} $

Question 1

Which component of the plasma membrane is primarily responsible for its fluidity and flexibility, and also acts as an antifreeze in cold temperatures?

Accepted Answer

Cholesterol

Question 2

A cell is placed in a hypertonic solution. What will happen to the cell's water content?

Accepted Answer

Water will move out of the cell, causing it to shrink.

Question 3

Which equation best describes the movement of molecules during diffusion?

Accepted Answer

$ J = -D \frac{dC}{dx} $

Question 4

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

Accepted Answer

Increasing membrane fluidity

Question 5

A red blood cell placed in a hypotonic solution will:

Accepted Answer

Burst due to water intake

Question 6

Which type of transport requires ATP and moves substances against their concentration gradient?

Accepted Answer

Active transport

Question 7

Which of the following best describes the amphipathic nature of phospholipids?

Accepted Answer

They have two hydrophobic tails and a hydrophilic head.

Question 8

Which process is illustrated by the movement of water across a selectively permeable membrane from an area of low solute concentration to high solute concentration?

Accepted Answer

Osmosis

Question 9

Which equation represents the energy requirement for active transport?

Accepted Answer

$ 	ext{ATP} ightarrow 	ext{ADP} + 	ext{P} $

Question 10

Which type of membrane protein is directly involved in cell-to-cell communication and tissue formation?

Accepted Answer

Cell adhesion proteins

Question 11

A cell uses receptor-mediated endocytosis to import cholesterol. Which step is essential for this process?

Accepted Answer

Binding of cholesterol to a specific membrane receptor

Question 12

Which of the following is a real-life example of phagocytosis?

Accepted Answer

Macrophages engulfing bacteria

Question 13

Which equation best represents the net movement of water in an isotonic solution?

Accepted Answer

$ 	ext{Water}_{in} = 	ext{Water}_{out} $

Question 14

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

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

Question 15

Which of the following is NOT a characteristic of the fluid-mosaic model of the plasma membrane?

Accepted Answer

The membrane is rigid and immobile.

Question 16

Which type of transport is illustrated by the movement of oxygen and carbon dioxide across the cell membrane?

Accepted Answer

Simple diffusion

Question 17

Which equation describes the concentration gradient across a membrane?

Accepted Answer

$ \Delta C = C_{outside} - C_{inside} $

Question 18

Which of the following is a function of carbohydrates in the plasma membrane?

Accepted Answer

Increasing cell specificity and helping cells form tissues

Question 19

Which process is used by cells to release large molecules, such as hormones, into the extracellular space?

Accepted Answer

Exocytosis

Question 20

Which of the following best explains why the plasma membrane is described as 'semi-permeable'?

Accepted Answer

It allows some molecules to cross while restricting others.

Cell Membranes: Structure, Function, and Transport Mechanisms

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