$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Chemical\ Energy\ (in\ ATP)}}$$

Question 1

Which of the following is NOT a major function of membrane proteins as illustrated in the study materials?

Accepted Answer

Energy storage

Question 2

According to the membrane permeability scale, which molecule would diffuse most easily across a phospholipid bilayer?

Accepted Answer

O$$_2$$

Question 3

A cell is placed in a hypertonic solution. What is the most likely outcome for an animal cell?

Accepted Answer

It will shrivel due to water loss.

Question 4

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient via transport proteins without energy input.

Question 5

Which equation best represents the chemical reaction of cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Chemical\ Energy\ (in\ ATP)}}$$

Question 6

Which of the following molecules would require a transport protein to cross the cell membrane?

Accepted Answer

Na$$^+$$

Question 7

What is the primary difference between simple diffusion and active transport?

Accepted Answer

Active transport requires energy input, while simple diffusion does not.

Question 8

If a plant cell is placed in a hypotonic solution, what will happen?

Accepted Answer

It will become turgid as water enters the cell.

Question 9

Which process is responsible for the movement of oxygen from the lungs into the blood?

Accepted Answer

Simple diffusion

Question 10

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the diffusion of free water across a selectively permeable membrane.

Question 11

A cell uses the Na$$^+/K$^+$$ pump to maintain ion gradients. Which step occurs first in the pump's cycle?

Accepted Answer

Three Na$$^+$$ ions bind to the pump.

Question 12

Which type of membrane transport is most directly involved in the uptake of cholesterol (LDL) by cells?

Accepted Answer

Receptor-mediated endocytosis

Question 13

Which of the following best describes the role of channel proteins in the cell membrane?

Accepted Answer

They facilitate the passive movement of specific ions or molecules across the membrane.

Question 14

Which scenario would most likely require active transport?

Accepted Answer

A cell importing glucose against its concentration gradient.

Question 15

What is the main reason ions such as Na$$^+$$ and K$$^+$$ cannot freely cross the lipid bilayer?

Accepted Answer

They are charged and hydrophilic, making them unable to pass through the hydrophobic core.

Question 16

Which of the following is an example of exocytosis?

Accepted Answer

Release of neurotransmitters from a neuron

Question 17

Which property of molecules most affects their ability to diffuse across the cell membrane?

Accepted Answer

Size and charge

Question 18

Which of the following best describes the electrical gradient across a cell membrane?

Accepted Answer

The inside of the cell is negative compared to the outside.

Question 19

Which process is illustrated when a cell engulfs a bacterium?

Accepted Answer

Phagocytosis

Question 20

A contractile vacuole in a freshwater protist is most active when the organism is in which type of environment?

Accepted Answer

Hypotonic

Cell Membranes: Structure, Function, and Transport Mechanisms

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