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

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

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

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

Question 1

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

Accepted Answer

A dynamic structure with protein molecules bobbing in a fluid bilayer of phospholipids

Question 2

What is the primary reason that the plasma membrane is selectively permeable?

Accepted Answer

The hydrophobic core of the lipid bilayer prevents passage of hydrophilic molecules

Question 3

Which type of membrane protein is most likely to be involved in signal transduction?

Accepted Answer

Integral transmembrane protein

Question 4

A cell is placed in a solution with a higher concentration of solute than inside the cell. What will happen to the cell?

Accepted Answer

It will shrivel as water leaves the cell

Question 5

Which equation correctly represents the movement of water during osmosis?

Accepted Answer

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

Question 6

Which process requires energy input from ATP to move substances across the plasma membrane?

Accepted Answer

Active transport

Question 7

A sodium-potassium pump moves $$	ext{Na}^+$$ out of the cell and $$	ext{K}^+$$ into the cell against their concentration gradients. Which type of transport is this?

Accepted Answer

Active transport

Question 8

Which of the following molecules can most easily diffuse through the lipid bilayer of the plasma membrane?

Accepted Answer

Oxygen ($$O_2)$$

Question 9

A cell uses exocytosis to release insulin into the bloodstream. What is the main advantage of this bulk transport mechanism?

Accepted Answer

It enables the cell to secrete large molecules that cannot pass through the membrane directly

Question 10

Which statement best explains why facilitated diffusion is considered passive transport?

Accepted Answer

Substances move down their concentration gradient without energy input

Question 11

A cell in a hypotonic solution will most likely:

Accepted Answer

Gain water and swell

Question 12

Which of the following best describes the role of carrier proteins in the plasma membrane?

Accepted Answer

They bind specific molecules and change shape to shuttle them across the membrane

Question 13

Which of the following is an example of cotransport?

Accepted Answer

Movement of $$H^+$$ and sucrose together into a cell via a membrane protein

Question 14

Which equation represents the energy requirement for active transport?

Accepted Answer

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

Question 15

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

Accepted Answer

Synthesis of DNA

Question 16

A patient receives an intravenous solution that is isotonic to their blood cells. What effect will this have on the cells?

Accepted Answer

Cells will remain unchanged

Question 17

Which process is used by white blood cells to engulf bacteria?

Accepted Answer

Phagocytosis

Question 18

Which of the following statements about diffusion is correct?

Accepted Answer

Diffusion moves substances from high to low concentration

Question 19

Which type of channel protein opens or closes in response to a stimulus?

Accepted Answer

Gated ion channel

Question 20

A cell is observed to have a high rate of endocytosis. Which of the following is most likely occurring?

Accepted Answer

The cell is actively taking in large molecules or particles via vesicles

Membrane Structure and Function (Chapter 7) – Study Notes

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