Question 1

Which of the following best describes the process of facilitated diffusion across a cell membrane?

Accepted Answer

Movement of molecules from high to low concentration through membrane proteins without energy input.

Question 2

A red blood cell is placed in a hypertonic solution. What will most likely happen to the cell, and why?

Accepted Answer

The cell will shrink because water leaves the cell to the area of higher solute concentration.

Question 3

Which equation correctly represents the overall chemical reaction for cellular respiration?

Accepted Answer

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

Question 4

During which stage of cellular respiration is the majority of ATP produced, and what is the role of oxygen in this stage?

Accepted Answer

Oxidative phosphorylation; oxygen acts as the final electron acceptor in the electron transport chain.

Question 5

Which of the following best explains why enzymes are considered biological catalysts?

Accepted Answer

They speed up chemical reactions by lowering the activation energy without being consumed.

Question 6

A patient is given an intravenous solution that is hypotonic relative to their blood plasma. What is the most likely physiological effect?

Accepted Answer

Red blood cells will swell and may burst due to water entering the cells.

Question 7

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in the bonds between its phosphate groups.

Question 8

Which type of enzyme inhibition involves the inhibitor binding to the active site, preventing substrate binding?

Accepted Answer

Competitive inhibition

Question 9

A cell needs to move sodium ions from a low concentration outside the cell to a high concentration inside the cell. Which transport mechanism will it use?

Accepted Answer

Active transport using ATP

Question 10

Which of the following best describes the difference between endergonic and exergonic reactions?

Accepted Answer

Endergonic reactions require energy input; exergonic reactions release energy.

Question 11

Which of the following is a correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis → Pyruvate Oxidation → Citric Acid Cycle → Oxidative Phosphorylation

Question 12

A poison that blocks the final electron acceptor in the electron transport chain would directly result in which of the following?

Accepted Answer

Accumulation of NADH and FADH$$_2$$ and cessation of ATP production by oxidative phosphorylation

Question 13

Which of the following best explains why oxygen is essential for aerobic cellular respiration?

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, allowing ATP production to continue.

Question 14

Which of the following is a real-life example of active transport in human physiology?

Accepted Answer

Sodium-potassium pump maintaining nerve cell membrane potential.

Question 15

If a mutation caused aquaporins to become nonfunctional in kidney cells, what would be the most likely physiological consequence?

Accepted Answer

Impaired water reabsorption, leading to excessive water loss in urine.

Question 16

Which of the following best describes the role of redox reactions in cellular respiration?

Accepted Answer

Redox reactions transfer electrons from glucose to oxygen, releasing energy.

Question 17

A cell is placed in an isotonic solution. What will happen to the cell's volume, and why?

Accepted Answer

The cell's volume will remain unchanged because water moves in and out at equal rates.

Question 18

Which of the following is a multi-step process that integrates both passive and active transport mechanisms in a neuron during an action potential?

Accepted Answer

Sodium ions enter the neuron by passive diffusion during depolarization, and the sodium-potassium pump restores ion gradients using ATP.

Question 19

Which of the following best explains why feedback inhibition is important in metabolic pathways?

Accepted Answer

It prevents the overaccumulation of end products by inhibiting an early enzyme in the pathway.

Cellular Processes: Transport, Energy, and Metabolism

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