Q: Which equation correctly represents the process of cellular respiration?

$C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy}$

Question 1

Which of the following best describes the primary function of the cell membrane in animal cells?

Accepted Answer

It regulates the movement of substances into and out of the cell.

Question 2

A freshwater protozoan is placed in a saltwater environment. Which process will most likely occur, and why?

Accepted Answer

Water will leave the cell by osmosis, causing it to shrink.

Question 3

Which of the following best explains why the inner mitochondrial membrane is highly folded?

Accepted Answer

To increase the surface area for ATP production.

Question 4

Which equation correctly represents the process of cellular respiration?

Accepted Answer

$C_6H_{12}O_6 + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}$

Question 5

A patient is diagnosed with a genetic disorder that affects the structure of their lysosomal membranes. Which cellular process is most likely to be impaired?

Accepted Answer

Intracellular digestion of macromolecules

Question 6

Which of the following mechanisms is used by cells to transport large molecules across the plasma membrane?

Accepted Answer

Endocytosis

Question 7

A red blood cell is placed in a hypotonic solution. What will happen to the cell, and which process is responsible?

Accepted Answer

It will swell and possibly burst due to osmosis.

Question 8

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

Accepted Answer

ATP provides energy for cellular processes by releasing a phosphate group.

Question 9

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

Accepted Answer

Simple diffusion

Question 10

A cell is observed to have a high concentration of sodium ions outside and a low concentration inside. Which mechanism maintains this gradient?

Accepted Answer

Sodium-potassium pump using ATP

Question 11

Which of the following statements about enzyme activity is correct?

Accepted Answer

Enzymes lower the activation energy of a reaction.

Question 12

Which of the following best explains why plant cells do not burst when placed in a hypotonic solution?

Accepted Answer

The cell wall provides structural support and prevents excessive expansion.

Question 13

Which of the following is an example of active transport in cells?

Accepted Answer

Pumping protons ($H^+$) into the stomach lining against their concentration gradient.

Question 14

A scientist observes that a certain molecule moves across the cell membrane only when a specific protein is present, and no energy is required. Which transport mechanism is being described?

Accepted Answer

Facilitated diffusion

Question 15

Which of the following best describes the relationship between surface area and volume in cells as they grow larger?

Accepted Answer

Volume increases faster than surface area, reducing efficiency.

Question 16

Which process is directly responsible for the uptake of cholesterol into animal cells?

Accepted Answer

Receptor-mediated endocytosis

Question 17

A cell is placed in a solution and begins to lose water. Which of the following best describes the solution?

Accepted Answer

Hypertonic

Question 18

Which of the following is a correct statement about the sodium-potassium pump?

Accepted Answer

It requires ATP to function.

Question 19

Which of the following best explains why oxygen and carbon dioxide can easily cross the plasma membrane?

Accepted Answer

They are small and nonpolar molecules.

Question 20

A cell uses energy to move calcium ions from a low concentration inside the cell to a high concentration outside. Which equation best represents the energy change involved in this process?

Accepted Answer

$\Delta G > 0$

Cell Structure, Membranes, and Transport Mechanisms

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