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

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

Question 1

Which of the following best describes the relationship between photosynthesis and cellular respiration in the context of energy flow in ecosystems?

Accepted Answer

Photosynthesis converts light energy into chemical energy, and cellular respiration breaks down organic molecules to release energy for cellular work.

Question 2

Which equation correctly represents the overall process of cellular respiration?

Accepted Answer

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

Question 3

During cellular respiration, which molecule acts as the primary electron carrier, accepting electrons during glycolysis and the citric acid cycle?

Accepted Answer

NAD+

Question 4

In the redox reaction $$\mathrm{Na} + \mathrm{Cl} \rightarrow \mathrm{Na^+} + \mathrm{Cl^-}$$, which element is oxidized and which is reduced?

Accepted Answer

Na is oxidized, Cl is reduced

Question 5

Which stage of cellular respiration occurs in the cytosol of eukaryotic cells?

Accepted Answer

Glycolysis

Question 6

Why is ATP required during the energy investment phase of glycolysis?

Accepted Answer

To phosphorylate glucose and destabilize it for subsequent breakdown

Question 7

Which process directly produces ATP by transferring a phosphate group from a substrate molecule to ADP?

Accepted Answer

Substrate-level phosphorylation

Question 8

What is the main function of the electron transport chain in cellular respiration?

Accepted Answer

To transfer electrons and create a proton gradient for ATP synthesis

Question 9

During oxidative phosphorylation, how is ATP generated?

Accepted Answer

By the movement of protons through ATP synthase, driven by a proton gradient

Question 10

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD+ in the absence of oxygen.

Question 11

In lactic acid fermentation, what is the fate of pyruvate?

Accepted Answer

It is reduced directly by NADH to form lactate.

Question 12

Which molecule is the final electron acceptor in aerobic cellular respiration?

Accepted Answer

O2

Question 13

What is the net ATP yield from glycolysis per molecule of glucose?

Accepted Answer

2 ATP

Question 14

Which enzyme is a key regulatory point in glycolysis, responding to cellular ATP levels?

Accepted Answer

Phosphofructokinase

Question 15

Which of the following statements about the citric acid cycle is true?

Accepted Answer

It completes the oxidation of glucose and produces NADH, FADH2, and ATP.

Question 16

Which process is responsible for the majority of ATP production during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 17

Why is it not possible to state an exact number of ATP molecules generated by the oxidation of a molecule of glucose?

Accepted Answer

Because the efficiency of electron transport and ATP synthase can vary, and some energy is lost as heat.

Question 18

Which of the following food molecules yields the most ATP when oxidized?

Accepted Answer

Fats

Question 19

What is the basic function of fermentation?

Accepted Answer

To regenerate NAD+ so glycolysis can continue in the absence of oxygen.

Question 20

Which of the following best explains the concept of chemiosmosis in cellular respiration?

Accepted Answer

The movement of protons across a membrane, creating a gradient that drives ATP synthesis.

Cellular Respiration and Fermentation: Energy Production in Cells

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