Q: Which of the following equations correctly represents the overall process of cellular respiration?

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2 \rightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + \text{energy}$$

Question 1

Which of the following statements correctly describes the role of NAD+ during cellular respiration?

Accepted Answer

NAD+ is reduced to NADH during glycolysis and the Krebs cycle, temporarily storing energy by accepting electrons.

Question 2

During aerobic respiration, what is the correct sequence of events for the breakdown of one molecule of glucose?

Accepted Answer

Glycolysis → Pyruvate oxidation → Krebs cycle → Oxidative phosphorylation

Question 3

Which of the following best explains the difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group from a substrate to ADP, while oxidative phosphorylation uses the energy from a proton gradient generated by the electron transport chain to produce ATP.

Question 4

What is the role of oxygen in aerobic cellular respiration?

Accepted Answer

Oxygen is the final electron acceptor in the electron transport chain, forming water.

Question 5

Which of the following equations correctly represents the overall process of cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2 ightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + 	ext{energy}$$

Question 6

During glycolysis, a molecule of glucose (6 carbons) is converted into two molecules of pyruvate. What is the total number of carbons present in the two pyruvate molecules?

Accepted Answer

6

Question 7

In the electron transport chain (ETC), how is the proton gradient across the inner mitochondrial membrane established?

Accepted Answer

By pumping protons from the mitochondrial matrix to the intermembrane space as electrons are passed along the chain.

Question 8

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD+ by transferring electrons to an organic molecule, allowing glycolysis to continue in the absence of oxygen.

Question 9

Which of the following is the correct equation for photosynthesis?

Accepted Answer

$$6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2$$

Question 10

Which molecule is the primary carbon dioxide acceptor in the Calvin cycle, and what is the name of the sugar produced in the second stage?

Accepted Answer

Ribulose bisphosphate (RuBP); Glyceraldehyde-3-phosphate (G3P)

Question 11

Which adaptation allows CAM plants to survive in arid environments?

Accepted Answer

They open their stomata only at night to minimize water loss.

Question 12

Which of the following best describes the relationship between the light reactions and the Calvin cycle in photosynthesis?

Accepted Answer

The light reactions produce ATP and NADPH, which are used by the Calvin cycle to fix carbon dioxide.

Question 13

Photorespiration occurs when Rubisco binds to which molecule, and what is the consequence for the plant?

Accepted Answer

Oxygen; it leads to the consumption of energy and release of fixed carbon as CO2, reducing photosynthetic efficiency.

Question 14

Which of the following statements correctly distinguishes autotrophs from heterotrophs?

Accepted Answer

Autotrophs use light or inorganic chemicals to produce organic molecules, while heterotrophs must consume organic molecules for energy.

Question 15

Which pigment is primarily responsible for absorbing light energy during photosynthesis, and what is its main absorption spectrum?

Accepted Answer

Chlorophyll a; absorbs mainly blue and red wavelengths

Question 16

During which stage of mitosis do sister chromatids separate and move toward opposite poles of the cell?

Accepted Answer

Anaphase

Question 17

A patient’s muscle cells are deprived of oxygen during intense exercise. Which process allows the cells to continue producing ATP, and what is the byproduct?

Accepted Answer

Lactic acid fermentation; lactic acid

Question 18

Which of the following best describes the function of Photosystem II in the light reactions of photosynthesis?

Accepted Answer

It absorbs light energy to split water molecules, releasing oxygen and providing electrons to the electron transport chain.

Question 19

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 20

Which of the following statements about the electron transport chain (ETC) and ATP synthesis is correct?

Accepted Answer

The ETC creates a proton gradient across the inner mitochondrial membrane, and ATP synthase uses this gradient to synthesize ATP.

Comprehensive Study Guide for General Biology: Cellular Respiration, Photosynthesis, and Cell Division

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