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

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} \rightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + \text{energy}$$

Question 1

Which of the following statements best describes the role of oxygen in aerobic cellular respiration?

Accepted Answer

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

Question 2

During glycolysis, glucose (a 6-carbon molecule) is broken down into two molecules of pyruvate. What is the total net gain of ATP and NADH molecules per glucose molecule during glycolysis?

Accepted Answer

2 ATP and 2 NADH

Question 3

Which of the following equations correctly represents aerobic cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} ightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + 	ext{energy}$$

Question 4

Which process is responsible for the majority of ATP production during aerobic respiration, and what is the mechanism by which it occurs?

Accepted Answer

Oxidative phosphorylation; ATP is produced as protons flow through ATP synthase due to the proton gradient established by the electron transport chain.

Question 5

Which molecule acts as the primary electron carrier during cellular respiration, and how is it regenerated?

Accepted Answer

NAD+; it is regenerated when NADH donates electrons to the electron transport chain.

Question 6

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

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP from a substrate, while oxidative phosphorylation uses a proton gradient to drive ATP synthesis.

Question 7

In the absence of oxygen, yeast cells undergo fermentation. What are the main products of alcoholic fermentation?

Accepted Answer

Ethanol, CO$$_2$$, and ATP

Question 8

Which of the following best explains why C4 and CAM plants are better adapted to dry climates than C3 plants?

Accepted Answer

C4 and CAM plants minimize photorespiration by spatially or temporally separating carbon fixation from the Calvin cycle.

Question 9

During the Calvin cycle, which molecule acts as the carbon dioxide acceptor, and what is the name of the sugar produced in the second stage?

Accepted Answer

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

Question 10

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 in the Calvin cycle to fix carbon dioxide into sugars.

Question 11

Which of the following is a correct description of the flow of electrons during the light reactions of photosynthesis?

Accepted Answer

Electrons flow from water to Photosystem II, then to Photosystem I, and finally to NADP+ to form NADPH.

Question 12

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 13

Which of the following best describes the process of photorespiration?

Accepted Answer

Photorespiration occurs when Rubisco binds O$$_2$$ instead of CO$$_2$$, leading to the consumption of energy and release of CO$$_2.$$

Question 14

Which of the following correctly matches the stage of mitosis with its main event?

Accepted Answer

Metaphase: Chromosomes align at the cell's equator.

Question 15

Which of the following is the correct sequence of events for the gradual decline of carbons from glucose to acetyl-CoA during cellular respiration?

Accepted Answer

Glucose (6C) → 2 Pyruvate (3C each) → 2 Acetyl-CoA (2C each) + 2 CO$$_2$$

Question 16

Which of the following statements best distinguishes autotrophs from heterotrophs?

Accepted Answer

Autotrophs produce their own organic molecules from inorganic sources, while heterotrophs obtain organic molecules by consuming other organisms.

Question 17

Which of the following best explains how the electron transport chain (ETC) generates ATP?

Accepted Answer

The ETC pumps protons across the inner mitochondrial membrane, creating a proton gradient that drives ATP synthesis via ATP synthase.

Question 18

Which of the following is true regarding the final electron acceptors in aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration uses O$$_2 as $$the final electron acceptor, while anaerobic respiration uses other molecules such as nitrate or sulfate.

Question 19

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

Accepted Answer

S phase of interphase

Comprehensive Study Guidance for Cellular Respiration, Photosynthesis, and Cell Division (BIOL 1406)

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