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 its intermediates, making them more reactive

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 from NADH and FADH2 to oxygen, creating a proton gradient for ATP synthesis

Question 9

Which of the following best explains why ATP synthase is considered a molecular rotary motor?

Accepted Answer

It rotates as protons flow through it, catalyzing the phosphorylation of ADP to ATP.

Question 10

During the citric acid cycle, what is the fate of the carbon atoms from glucose?

Accepted Answer

They are released as CO2.

Question 11

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 12

In lactic acid fermentation, what happens to pyruvate?

Accepted Answer

It is reduced by NADH to form lactate.

Question 13

Which of the following is a reason why the exact number of ATP molecules generated from the oxidation of one glucose molecule cannot be stated?

Accepted Answer

Some protons leak across the mitochondrial membrane, and the shuttle mechanisms for NADH vary.

Question 14

Which enzyme plays a key role in regulating glycolysis through feedback inhibition?

Accepted Answer

Phosphofructokinase

Question 15

Which of the following statements about the catabolism of fats is correct?

Accepted Answer

Fatty acids are broken down by beta oxidation to yield acetyl CoA, NADH, and FADH2.

Question 16

Which of the following is a correct description of oxidative phosphorylation?

Accepted Answer

It is powered by redox reactions and involves the electron transport chain and chemiosmosis.

Question 17

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

Accepted Answer

O2

Question 18

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

Accepted Answer

2 ATP

Question 19

Which of the following best describes the fate of NADH produced during glycolysis under anaerobic conditions?

Accepted Answer

NADH is oxidized by transferring electrons to pyruvate or its derivatives, regenerating NAD+.

Question 20

Which of the following is a real-world application of fermentation?

Accepted Answer

Brewing, winemaking, and baking by yeast

Cellular Respiration and Fermentation: Energy Production in Cells

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