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

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (ATP)}$$

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 (ETC). 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 correctly traces the decline in carbon atoms 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 5

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

Accepted Answer

To split water molecules, releasing O$$_2$$ and providing electrons to the electron transport chain

Question 6

Which of the following equations correctly represents aerobic cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy (ATP)}$$

Question 7

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 8

During fermentation in human muscle cells, which molecule acts as the final electron acceptor, and what is the main product?

Accepted Answer

Pyruvate; lactic acid

Question 9

Which of the following best explains the difference between C$$_3$$, C$$_4$$, and CAM plants in their adaptation to dry climates?

Accepted Answer

C$$_4$$ and CAM plants minimize photorespiration by separating carbon fixation from the Calvin cycle either spatially (C$$_4) or $$temporally (CAM)

Question 10

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

Accepted Answer

Ribulose bisphosphate (RuBP); 3-phosphoglycerate (3-PGA)

Question 11

A scientist is studying a cell that can survive in the absence of oxygen by using an alternative final electron acceptor. Which process is this cell most likely performing?

Accepted Answer

Anaerobic respiration

Question 12

Which of the following statements about NAD$$^+$$ and NADP$$^+ is $$correct?

Accepted Answer

NAD$$^+ is $$primarily involved in catabolic reactions like cellular respiration, while NADP$$^+ is $$mainly used in anabolic reactions such as photosynthesis

Question 13

Which of the following best describes the role of the proton gradient in the mitochondria during oxidative phosphorylation?

Accepted Answer

It drives ATP synthesis by providing energy for ATP synthase to convert ADP and inorganic phosphate into ATP

Question 14

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

Accepted Answer

Prophase → Metaphase → Anaphase → Telophase → Cytokinesis

Question 15

Which of the following best explains 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 and reducing power in the Calvin cycle

Question 16

Which of the following is a key difference between autotrophs and 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 describes photorespiration?

Accepted Answer

A process in which Rubisco adds O$$_2$$ instead of CO$$_2 to $$RuBP, leading to decreased photosynthetic efficiency

Question 18

During which stage of interphase does DNA replication occur?

Accepted Answer

S phase

Question 19

A cell is observed to have chromosomes aligned at the center of the cell, with spindle fibers attached to the centromeres. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 20

Which of the following is a product of the Krebs cycle for each acetyl-CoA molecule that enters?

Accepted Answer

3 NADH, 1 FADH$$_2$$, 1 ATP (or GTP), and 2 CO$$_2$$

General Biology Exam 3 Study Guide: Cellular Respiration, Photosynthesis, and Cell Division

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