Question 1

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

Accepted Answer

A mosaic of protein molecules bobbing in a fluid bilayer of phospholipids.

Question 2

What is the primary reason that phospholipids with unsaturated hydrocarbon tails increase membrane fluidity?

Accepted Answer

The bends in their tails prevent phospholipids from packing tightly together.

Question 3

Which of the following is a function of membrane carbohydrates?

Accepted Answer

Cell-cell recognition and communication.

Question 4

A red blood cell is placed in a hypotonic solution. What will most likely happen to the cell?

Accepted Answer

It will burst (lyse) due to water entering the cell.

Question 5

Which of the following best explains why plant cells do not burst when placed in a hypotonic solution?

Accepted Answer

They have a rigid cell wall that prevents excessive expansion.

Question 6

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It uses transport proteins to move substances down their concentration gradient.

Question 7

The sodium-potassium pump is an example of which type of membrane transport?

Accepted Answer

Active transport

Question 8

Which equation best represents the movement of water during osmosis?

Accepted Answer

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

Question 9

A cell with an internal solute concentration of $$0.03\ M$$ sucrose and $$0.02\ M$$ glucose is placed in an environment with $$0.01\ M$$ sucrose, $$0.01\ M$$ glucose, and $$0.01\ M$$ fructose. What will happen to the cell?

Accepted Answer

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

Question 10

Which of the following is a key feature of receptor-mediated endocytosis?

Accepted Answer

It enables the cell to acquire bulk quantities of specific substances using receptor proteins.

Question 11

Which of the following best describes the role of cholesterol in the plasma membrane?

Accepted Answer

It helps stabilize membrane fluidity across temperature changes.

Question 12

Which of the following is true about the specificity of transport proteins?

Accepted Answer

They are specific and only allow certain molecules or ions to pass.

Question 13

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

Accepted Answer

Synthesis of DNA

Question 14

Which process requires energy input from the cell?

Accepted Answer

Active transport

Question 15

What is the main difference between channel proteins and carrier proteins?

Accepted Answer

Channel proteins provide a hydrophilic channel, while carrier proteins change shape to move substances.

Question 16

Which of the following best describes cotransport?

Accepted Answer

The use of one substance moving down its concentration gradient to drive the movement of another substance against its gradient.

Question 17

Which side of the plasma membrane is typically more positive due to membrane potential?

Accepted Answer

The extracellular side

Question 18

Which of the following is an example of bulk transport?

Accepted Answer

Exocytosis of neurotransmitters

Question 19

Which of the following best describes the process of phagocytosis?

Accepted Answer

A cell engulfs a particle by extending pseudopodia and forming a food vacuole.

Question 20

Which of the following best explains why each solute diffuses independently across a membrane?

Accepted Answer

Each solute moves according to its own concentration gradient.

Membrane Structure and Function: Study Guide for General Biology

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드