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

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

Q: Which of the following is the correct equation for photosynthesis?

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

Question 1

Which of the following statements best describes the role of NAD+ in cellular respiration?

Accepted Answer

NAD+ functions as an electron carrier, accepting electrons during glycolysis and the Krebs cycle, and is regenerated during oxidative phosphorylation.

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

Which of the following equations correctly represents aerobic 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 5

In the electron transport chain (ETC) of mitochondria, what is the immediate source of energy used to synthesize ATP?

Accepted Answer

The proton gradient established across the inner mitochondrial membrane

Question 6

Which of the following best describes the fate of carbon atoms from glucose during aerobic respiration?

Accepted Answer

Carbons are gradually released as $$\mathrm{CO}_2$$ during pyruvate oxidation and the Krebs cycle.

Question 7

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD+ by transferring electrons to organic molecules such as pyruvate or acetaldehyde.

Question 8

Which of the following is the correct equation for photosynthesis?

Accepted Answer

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

Question 9

Which molecule acts as the carbon dioxide acceptor in the Calvin cycle?

Accepted Answer

Ribulose-1,5-bisphosphate (RuBP)

Question 10

Which of the following adaptations allows CAM plants to survive in arid environments?

Accepted Answer

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

Question 11

During the light reactions of photosynthesis, what is the primary function of Photosystem II?

Accepted Answer

To split water molecules, releasing oxygen and providing electrons to the electron transport chain.

Question 12

Which of the following best describes photorespiration?

Accepted Answer

A process in which oxygen is used instead of carbon dioxide by Rubisco, leading to the release of $$\mathrm{CO}_2$$ and a decrease in photosynthetic efficiency.

Question 13

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 14

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-violet and red wavelengths

Question 15

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

Accepted Answer

Anaphase

Question 16

A patient’s muscle cells are deprived of oxygen during intense exercise. Which process will their cells rely on to generate ATP, and what is the likely byproduct?

Accepted Answer

Lactic acid fermentation; lactate

Question 17

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

Accepted Answer

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

Question 18

Which of the following is a correct description of the events during metaphase of mitosis?

Accepted Answer

Chromosomes align at the cell’s equatorial plate, attached to spindle fibers from opposite poles.

Question 19

Which of the following statements about the relationship between the light reactions and the Calvin cycle is correct?

Accepted Answer

The light reactions provide ATP and NADPH to the Calvin cycle, which uses them to fix carbon dioxide into sugars.

Question 20

A mutation prevents the formation of the proton gradient across the inner mitochondrial membrane. Which process would be most directly affected?

Accepted Answer

ATP synthesis by ATP synthase during oxidative phosphorylation

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