$$\text{Glucose} + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} + \text{ATP}$$

Question 1

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

Accepted Answer

The membrane consists of a fluid phospholipid bilayer with embedded proteins that move freely.

Question 2

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

Accepted Answer

The cell will shrink as water leaves the cell.

Question 3

Which of the following is true about passive transport?

Accepted Answer

It relies on the concentration gradient and does not require energy input.

Question 4

What is the primary function of aquaporins in the cell membrane?

Accepted Answer

Facilitate the rapid diffusion of water across the membrane.

Question 5

Which equation best represents the conservation of energy in cellular respiration?

Accepted Answer

$$	ext{Glucose} + 	ext{O}_2 ightarrow 	ext{CO}_2 + 	ext{H}_2	ext{O} + 	ext{ATP}$$

Question 6

A cell actively transports $$	ext{Ca}^{2+}$$ ions out of the cytoplasm. Where is $$	ext{Ca}^{2+}$$ more concentrated?

Accepted Answer

Outside the cell

Question 7

Which of the following best describes the role of ATP in cellular work?

Accepted Answer

ATP transfers a phosphate group to other molecules, coupling exergonic and endergonic reactions.

Question 8

Which process is used by cells to import large molecules such as proteins?

Accepted Answer

Endocytosis

Question 9

What is the main difference between competitive and noncompetitive enzyme inhibition?

Accepted Answer

Competitive inhibitors bind to the active site, while noncompetitive inhibitors bind elsewhere and change the enzyme's shape.

Question 10

Which of the following is an example of an exergonic reaction?

Accepted Answer

Cellular respiration releasing energy from glucose

Question 11

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

Accepted Answer

It will become flaccid.

Question 12

Which membrane protein is responsible for relaying messages from signaling molecules?

Accepted Answer

Receptor protein

Question 13

Which of the following best describes osmosis?

Accepted Answer

The diffusion of water across a selectively permeable membrane.

Question 14

Which equation represents the change in free energy ($$\Delta G) $$for a chemical reaction?

Accepted Answer

$$\Delta G = G_{products} - G_{reactants}$$

Question 15

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

Accepted Answer

Storing genetic information

Question 16

Which type of transport requires energy input from the cell?

Accepted Answer

Active transport

Question 17

What determines whether enzyme inhibition is reversible or irreversible?

Accepted Answer

The strength and type of bond formed between the inhibitor and the enzyme

Question 18

Which of the following best describes feedback inhibition?

Accepted Answer

The end product of a metabolic pathway inhibits an earlier enzyme in the pathway.

Question 19

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

Accepted Answer

Uptake of cholesterol by animal cells

Question 20

Which statement about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction.

Chapter 5: The Working Cell – Membrane Structure, Transport, and Enzyme Function

Study Guide - Practice Questions