Q: Which of the following equations correctly represents the overall process of 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

During cellular respiration, which molecule acts as the final electron acceptor in aerobic conditions, and what is the main product formed as a result?

Accepted Answer

Oxygen; water

Question 2

Which of the following best describes the process of substrate-level phosphorylation, and during which stages of cellular respiration does it primarily occur?

Accepted Answer

Direct transfer of a phosphate group to ADP from a phosphorylated intermediate; occurs in glycolysis and the Krebs cycle

Question 3

A patient is diagnosed with a mitochondrial disorder that impairs the electron transport chain. Which of the following would most likely be observed in this patient’s cells?

Accepted Answer

Decreased ATP production due to reduced oxidative phosphorylation

Question 4

Which of the following equations correctly represents the overall process of 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 5

During glycolysis, glucose is converted into two molecules of pyruvate. How many net ATP molecules are produced per glucose molecule during glycolysis, and by what mechanism?

Accepted Answer

2 net ATP by substrate-level phosphorylation

Question 6

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

Accepted Answer

NAD+ acts as an electron carrier, accepting electrons during glycolysis and the Krebs cycle and becoming reduced to NADH

Question 7

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

Accepted Answer

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

Question 8

Which adaptation allows C4 and CAM plants to minimize photorespiration in hot, dry climates?

Accepted Answer

They use alternative carbon fixation pathways that concentrate $$\mathrm{CO}_2$$ around Rubisco

Question 9

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, releasing oxygen and providing electrons to the electron transport chain

Question 10

A muscle cell is deprived of oxygen but continues to produce ATP. Which process is most likely responsible for ATP production under these conditions, and what is the main byproduct?

Accepted Answer

Lactic acid fermentation; lactic acid

Question 11

During the gradual breakdown of glucose in cellular respiration, how many carbons are lost as $$\mathrm{CO}_2$$ during the conversion of two pyruvate molecules to two acetyl-CoA molecules?

Accepted Answer

2 carbons

Question 12

Which of the following statements correctly compares autotrophs and heterotrophs?

Accepted Answer

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

Question 13

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

Accepted Answer

The ETC creates a proton gradient across the inner mitochondrial membrane, and ATP synthase uses this gradient to synthesize ATP from ADP and inorganic phosphate

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 and red wavelengths

Question 15

Which of the following is a correct sequence of events during mitosis?

Accepted Answer

Prophase → Metaphase → Anaphase → Telophase

Question 16

Which of the following best describes photorespiration?

Accepted Answer

A process where Rubisco fixes oxygen instead of carbon dioxide, leading to the loss of previously fixed carbon

Question 17

Which of the following is the correct equation for 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 18

During which stage of the cell cycle does DNA replication occur, and what is the significance of this event?

Accepted Answer

S phase of interphase; ensures each daughter cell receives an identical set of chromosomes

Question 19

Which of the following statements about fermentation is correct?

Accepted Answer

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

Question 20

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 as energy sources in the Calvin cycle to fix carbon dioxide

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

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