Question 1

Which of the following best explains why ATP is considered 'rechargeable' in cellular metabolism?

Accepted Answer

ATP can be broken down into ADP and Pi, and ADP can gain another phosphate to reform ATP.

Question 2

During aerobic cellular respiration, which stage produces the most ATP and what is the approximate yield per glucose molecule?

Accepted Answer

Electron Transport Chain; $$\approx 32-34$$ ATP

Question 3

A patient is exposed to cyanide poisoning. Which cellular process is directly inhibited, and what is the consequence for the cell?

Accepted Answer

Electron Transport Chain; ATP production stops, leading to cell death.

Question 4

Which macromolecule type are enzymes composed of, and what is their primary function in biological systems?

Accepted Answer

Proteins; speed up reactions by lowering activation energy.

Question 5

If a cell is deprived of oxygen, which process will it rely on for ATP production, and what is the net ATP yield per glucose?

Accepted Answer

Fermentation; $$2$$ ATP per glucose

Question 6

Which statement best describes the role of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

They deliver high-energy electrons to the electron transport chain for ATP production.

Question 7

What is the main function of the enzyme ATP synthase in mitochondria?

Accepted Answer

It uses the flow of H$$^+$$ ions down their concentration gradient to produce ATP.

Question 8

Which of the following best explains why enzymes are specific to their substrates?

Accepted Answer

Each enzyme fits only one type of substrate due to the shape of its active site.

Question 9

A researcher heats a protein enzyme to 90°C. What is the most likely outcome for the enzyme's activity?

Accepted Answer

The enzyme will lose its shape and function due to denaturation.

Question 10

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

Accepted Answer

Glycolysis $$\rightarrow$$ Krebs Cycle $$\rightarrow$$ Electron Transport Chain

Question 11

Which of the following best describes the effect of low oxygen availability on muscle cells during intense exercise?

Accepted Answer

Muscle cells switch to anaerobic respiration, leading to lactic acid buildup and sore muscles.

Question 12

Which of the following food molecules can be used for energy production in cellular respiration?

Accepted Answer

Carbohydrates, lipids, and proteins

Question 13

Which protein structure level is defined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 14

What is the main difference between aerobic respiration and fermentation in terms of ATP yield per glucose?

Accepted Answer

Aerobic respiration produces $$36-38$$ ATP, while fermentation produces $$2$$ ATP per glucose.

Question 15

Which of the following best describes the role of the mitochondrial inner membrane in cellular respiration?

Accepted Answer

It houses the electron transport chain and ATP synthase, facilitating ATP production.

Question 16

A person has a high BMI and LDL levels. Which health risks are most associated with these conditions?

Accepted Answer

Obesity and clogged arteries, increasing risk of heart disease.

Question 17

Which of the following statements about enzyme denaturation is correct?

Accepted Answer

Denaturation occurs when an enzyme loses its shape due to heat, pH, or salt concentration, resulting in loss of function.

Question 18

Which process is responsible for breaking glucose into two pyruvate molecules, and where does it occur?

Accepted Answer

Glycolysis; cytoplasm

Question 19

Which enzyme works best in acidic conditions, and where is it found?

Accepted Answer

Pepsin; stomach

Question 20

Which of the following is true about the concentration gradient of H$$^+$$ ions in the mitochondria during cellular respiration?

Accepted Answer

H$$^+$$ ions are pumped into the intermembrane space, creating a gradient that drives ATP synthesis.

Cellular Respiration, ATP, and Enzymes: General Biology Study Guide

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