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

$$\text{Water moves from}~[\text{low solute}]~\rightarrow~[\text{high solute}]$$

Question 1

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

Accepted Answer

A dynamic structure with proteins bobbing in a fluid phospholipid bilayer.

Question 2

Which type of molecule can most easily diffuse through the lipid bilayer of the plasma membrane without the help of a transport protein?

Accepted Answer

Oxygen (O\_2)

Question 3

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

Accepted Answer

It will burst (lyse) as water enters the cell.

Question 4

Which of the following statements about active transport is correct?

Accepted Answer

Active transport requires ATP to move substances against their concentration gradient.

Question 5

A cell is placed in a solution with a higher solute concentration than its cytoplasm. Which term best describes the solution, and what will happen to the cell?

Accepted Answer

Hypertonic; the cell will shrink.

Question 6

Which of the following is a function of membrane proteins?

Accepted Answer

Facilitating cell-cell recognition

Question 7

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

Accepted Answer

Osmosis

Question 8

Which of the following best explains why ions such as Na\^+ and K\^+ cannot easily cross the plasma membrane without assistance?

Accepted Answer

They are charged and cannot pass through the hydrophobic core of the membrane.

Question 9

Which of the following is an example of bulk transport across the plasma membrane?

Accepted Answer

Endocytosis of bacteria by a white blood cell

Question 10

A scientist observes that after fusing a mouse cell and a human cell, the membrane proteins become intermixed within an hour. What does this observation support?

Accepted Answer

Membrane proteins can move laterally within the lipid bilayer.

Question 11

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

Accepted Answer

It stabilizes membrane fluidity at different temperatures.

Question 12

Which equation best represents the movement of water during osmosis?

Accepted Answer

$$	ext{Water moves from}~[	ext{low solute}]~ightarrow~[	ext{high solute}]$$

Question 13

Which of the following is true about facilitated diffusion?

Accepted Answer

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

Question 14

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

Accepted Answer

It will become plasmolyzed as water leaves the cell.

Question 15

Which of the following best describes the function of a carrier protein in the plasma membrane?

Accepted Answer

It binds to specific molecules and changes shape to shuttle them across the membrane.

Question 16

Which process requires the hydrolysis of ATP to move ions such as Na\^+ and K\^+ across the plasma membrane?

Accepted Answer

Active transport

Question 17

Which of the following is a real-life example of receptor-mediated endocytosis?

Accepted Answer

Absorption of cholesterol by liver cells

Question 18

Which of the following statements about the permeability of the lipid bilayer is correct?

Accepted Answer

Small nonpolar molecules pass through the bilayer more easily than ions.

Question 19

Which of the following best describes cotransport?

Accepted Answer

The coupling of the downhill diffusion of one substance to the uphill transport of another.

Question 20

Which of the following is NOT a function of cell-surface proteins?

Accepted Answer

DNA replication

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