It moves Na\textsuperscript{+} out of the cell and K\textsuperscript{+} into the cell using active transport.

It produces NADH and FADH\textsubscript{2} for the electron transport chain.

$$\text{Glucose} + 2\text{NAD}^+ + 2\text{ADP} + 2\text{P}_i \rightarrow 2\text{Pyruvate} + 2\text{NADH} + 2\text{ATP} + 2\text{H}_2\text{O}$$

Question 1

Which of the following best describes the function of the sodium-potassium pump in animal cells?

Accepted Answer

It moves Na	extsuperscript{+} out of the cell and K	extsuperscript{+} into the cell using active transport.

Question 2

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

Accepted Answer

Water will enter the cell, causing it to swell and possibly burst.

Question 3

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

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 4

During cellular respiration, which molecule is the final electron acceptor in the electron transport chain?

Accepted Answer

O	extsubscript{2}

Question 5

Which process directly produces the most ATP during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 6

If a cell's mitochondria are damaged, which process will be most directly affected?

Accepted Answer

ATP production via oxidative phosphorylation

Question 7

Which of the following is NOT a product of glycolysis?

Accepted Answer

FADH	extsubscript{2}

Question 8

A mutation disables the enzyme hexokinase in a cell. What is the most immediate effect on cellular metabolism?

Accepted Answer

Glycolysis cannot begin because glucose cannot be phosphorylated.

Question 9

Which statement best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

ATP stores energy in its phosphate bonds, which can be hydrolyzed to release energy for cellular work.

Question 10

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient through a membrane protein without energy input.

Question 11

A patient is diagnosed with a defect in their aquaporin proteins. Which cellular process will be most affected?

Accepted Answer

Osmosis of water across the cell membrane

Question 12

Which of the following is a correct statement about the citric acid cycle?

Accepted Answer

It produces NADH and FADH	extsubscript{2} for the electron transport chain.

Question 13

Which formula represents the net reaction of glycolysis?

Accepted Answer

$$	ext{Glucose} + 2	ext{NAD}^+ + 2	ext{ADP} + 2	ext{P}_i ightarrow 2	ext{Pyruvate} + 2	ext{NADH} + 2	ext{ATP} + 2	ext{H}_2	ext{O}$$

Question 14

Which of the following is true about the movement of ions across the cell membrane?

Accepted Answer

Ions require specific transport proteins to cross the membrane due to their charge.

Question 15

A cell is placed in a solution with a higher concentration of solutes than inside the cell. What type of solution is this, and what will happen?

Accepted Answer

Hypertonic; the cell will shrink.

Question 16

Which of the following is a direct consequence of the electron transport chain in mitochondria?

Accepted Answer

Formation of a proton gradient across the inner mitochondrial membrane.

Question 17

Which process is responsible for the bulk movement of large molecules into the cell?

Accepted Answer

Endocytosis

Question 18

If a cell is unable to produce NAD	extsuperscript{+}, which metabolic pathway will be directly inhibited?

Accepted Answer

Glycolysis

Question 19

Which of the following statements about membrane potential is correct?

Accepted Answer

It is generated by the unequal distribution of ions across the cell membrane.

Cell Signaling and Signal Transduction Pathways

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