Q: Which equation best represents the energy requirement for active transport by the sodium-potassium pump?

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

Question 1

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

Accepted Answer

A dynamic structure with proteins embedded in or attached to a bilayer of phospholipids.

Question 2

Which of the following would increase membrane fluidity in a cell at low temperatures?

Accepted Answer

Adding more cholesterol to the membrane.

Question 3

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

Accepted Answer

The cell will burst due to water influx.

Question 4

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

Accepted Answer

Synthesis of DNA.

Question 5

Facilitated diffusion differs from simple diffusion in that:

Accepted Answer

Facilitated diffusion uses transport proteins to move molecules down their concentration gradient.

Question 6

Which of the following molecules would most likely cross the plasma membrane by simple diffusion?

Accepted Answer

O\_2

Question 7

The sodium-potassium pump moves ions across the membrane by:

Accepted Answer

Active transport using carrier proteins and ATP hydrolysis.

Question 8

Which equation best represents the energy requirement for active transport by the sodium-potassium pump?

Accepted Answer

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

Question 9

Which of the following best explains why plant cells do not burst in hypotonic solutions?

Accepted Answer

Plant cells have a rigid cell wall that prevents excessive expansion.

Question 10

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

Accepted Answer

Endocytosis

Question 11

Which statement about channel proteins is correct?

Accepted Answer

Channel proteins form hydrophilic pores that allow specific molecules to diffuse across the membrane.

Question 12

A cell is placed in an isotonic solution. What will happen to the cell?

Accepted Answer

There will be no net movement of water into or out of the cell.

Question 13

Which of the following best describes the role of membrane carbohydrates?

Accepted Answer

They are involved in cell-cell recognition and signaling.

Question 14

Which of the following is true about integral proteins?

Accepted Answer

They span the entire membrane and are involved in transport and signaling.

Question 15

Which process is responsible for the movement of water across the plasma membrane?

Accepted Answer

Osmosis

Question 16

Which of the following best describes the concentration gradient?

Accepted Answer

A difference in the concentration of a substance across a space.

Question 17

Which of the following is a correct example of facilitated diffusion?

Accepted Answer

Movement of glucose into a cell via a carrier protein.

Question 18

What is the main difference between passive and active transport?

Accepted Answer

Active transport requires energy input, while passive transport does not.

Question 19

Which of the following best describes the process of exocytosis?

Accepted Answer

The release of substances from the cell via vesicle fusion with the plasma membrane.

Question 20

Which of the following equations represents the movement of sodium and potassium ions by the sodium-potassium pump?

Accepted Answer

$$3\ 	ext{Na}^+_{	ext{in}} + 2\ 	ext{K}^+_{	ext{out}} + 	ext{ATP} ightarrow 3\ 	ext{Na}^+_{	ext{out}} + 2\ 	ext{K}^+_{	ext{in}} + 	ext{ADP} + 	ext{P}_i$$

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