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

$ \text{Water moves from an area of low solute concentration to an area of high solute concentration} $

Question 1

Which of the following best describes the structure of a biological membrane according to the fluid mosaic model?

Accepted Answer

A phospholipid bilayer with embedded proteins and other molecules that move laterally.

Question 2

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

Accepted Answer

Synthesizing DNA from RNA.

Question 3

A molecule moves from an area of high concentration to an area of low concentration across a membrane without the use of energy. What is this process called?

Accepted Answer

Simple diffusion

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

What is the main reason that biological membranes are described as 'selectively permeable'?

Accepted Answer

They allow some molecules to cross more easily than others.

Question 6

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

Accepted Answer

It stabilizes membrane fluidity across temperature changes.

Question 7

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

Accepted Answer

It will swell and possibly burst as water enters the cell.

Question 8

Which of the following best defines a concentration gradient?

Accepted Answer

A difference in the concentration of a substance between two areas.

Question 9

Which type of membrane protein is embedded within the cell membrane and usually spans the entire bilayer?

Accepted Answer

Integral membrane protein

Question 10

Which process requires energy input from the cell to move substances against their concentration gradient?

Accepted Answer

Active transport

Question 11

A cell is placed in a solution and water moves out of the cell, causing it to shrink. What type of solution is the cell in?

Accepted Answer

Hypertonic

Question 12

Which of the following is an example of bulk transport that involves the cell engulfing large particles?

Accepted Answer

Phagocytosis

Question 13

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

Accepted Answer

$ 	ext{Water moves from an area of low solute concentration to an area of high solute concentration} $

Question 14

Which of the following best explains why ions such as Na$ ^+ $ cannot easily cross the lipid bilayer without assistance?

Accepted Answer

They are charged and interact unfavorably with the hydrophobic core.

Question 15

A scientist observes that a certain protein spans the entire membrane and is involved in transporting glucose into the cell. This protein is best classified as:

Accepted Answer

An integral membrane protein

Question 16

Which of the following scenarios best illustrates facilitated diffusion?

Accepted Answer

Glucose entering a cell through a specific membrane protein

Question 17

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

Accepted Answer

Proteins and lipids can move laterally within the layer.

Question 18

Which of the following best describes the movement of molecules during diffusion?

Accepted Answer

Molecules move randomly, but net movement is from high to low concentration.

Question 19

Which of the following is a real-life example of active transport in human physiology?

Accepted Answer

Na$ ^+ $/K$ ^+ $ ATPase pumping Na$ ^+ $ out of and K$ ^+ $ into nerve cells.

Question 20

A cell needs to import a large, polar molecule that cannot diffuse through the membrane. Which process is most likely used?

Accepted Answer

Facilitated diffusion

Cell Membranes and Membrane Transport: Structure and Function

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