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

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

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

O$$_2$$, forming H$$_2O$$

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

Lactic acid fermentation; lactate

Question 4

Which of the following correctly traces the decline in carbon atoms from glucose to acetyl-CoA during cellular respiration?

Accepted Answer

6 (glucose) → 2 × 3 (pyruvate) → 2 × 2 (acetyl-CoA) + 2 CO$$_2$$

Question 5

Which equation correctly represents the overall process of cellular respiration?

Accepted Answer

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

Question 6

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

Accepted Answer

Both NAD$$^+$$ and NADP$$^+$$ are oxidized forms that accept electrons during metabolic reactions and are regenerated by donating electrons to the electron transport chain.

Question 7

In the electron transport chain (ETC) of mitochondria, how is the proton gradient established and what is its significance?

Accepted Answer

Protons are pumped from the mitochondrial matrix to the intermembrane space, creating a gradient that drives ATP synthesis as protons flow back through ATP synthase.

Question 8

Which of the following best describes the role of RuBP (ribulose bisphosphate) in the Calvin cycle?

Accepted Answer

RuBP is the carbon dioxide acceptor that combines with CO$$_2 to $$form 3-phosphoglycerate.

Question 9

A plant is exposed to hot, dry conditions. Which adaptation would you expect to find in a CAM plant that helps it survive in this environment?

Accepted Answer

Opening stomata only at night to minimize water loss while storing CO$$_2 as $$organic acids.

Question 10

Which of the following statements about photorespiration is correct?

Accepted Answer

Photorespiration occurs when rubisco fixes O$$_2$$ instead of CO$$_2$$, leading to the loss of fixed carbon and energy.

Question 11

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 12

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

Accepted Answer

Anaphase

Question 13

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 14

Which of the following is a correct comparison between autotrophs and heterotrophs?

Accepted Answer

Autotrophs use light or inorganic chemicals to produce organic molecules, while heterotrophs rely on consuming organic molecules from other organisms.

Question 15

Which of the following is the correct sequence of events during the stages of interphase in the cell cycle?

Accepted Answer

G$$_1$$ → S → G$$_2$$

Question 16

A scientist is studying a mutant plant that cannot regenerate NADP$$^+$$ during the light reactions. Which process would be directly affected as a result?

Accepted Answer

The electron transport chain in the light reactions would halt, stopping the production of NADPH.

Question 17

Which of the following best explains why oxygen is required for efficient ATP production in aerobic respiration?

Accepted Answer

Oxygen is needed to accept electrons at the end of the electron transport chain, allowing the chain to continue functioning and ATP to be produced.

Question 18

Which of the following is a product of the light reactions of photosynthesis that is used in the Calvin cycle?

Accepted Answer

ATP

Question 19

During which stage of cellular respiration is the majority of ATP produced, and by what mechanism?

Accepted Answer

Oxidative phosphorylation; chemiosmosis via ATP synthase

Question 20

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

Accepted Answer

It absorbs light energy to split water molecules, releasing O$$_2$$ and providing electrons to the electron transport chain.

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

Guida di studio - Domande di pratica

Study guide - Flashcard