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

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

Question 1

Which of the following best describes the main purpose of cellular respiration in eukaryotic cells?

Accepted Answer

To break down glucose and other high-energy molecules to produce ATP

Question 2

During glycolysis, what is the net gain of ATP and NADH molecules per molecule of glucose?

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 3

Which enzyme in glycolysis is allosterically inhibited by high levels of ATP, thus regulating the pathway?

Accepted Answer

Phosphofructokinase

Question 4

In the absence of oxygen, which process allows glycolysis to continue by regenerating NAD+?

Accepted Answer

Fermentation

Question 5

Which of the following is the correct sequence of events in cellular respiration?

Accepted Answer

Glycolysis → Pyruvate processing → Citric acid cycle → Electron transport chain

Question 6

What is the final electron acceptor in the electron transport chain during aerobic respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 7

Which of the following statements about substrate-level phosphorylation is TRUE?

Accepted Answer

It directly transfers a phosphate group from a substrate to ADP to form ATP

Question 8

A patient’s muscle cells are deprived of oxygen during intense exercise. Which metabolic pathway will their cells primarily use to generate ATP, and what byproduct will accumulate?

Accepted Answer

Fermentation; lactic acid

Question 9

Which of the following best explains why fats yield more ATP per gram than carbohydrates when used as an energy source?

Accepted Answer

Fats have more reduced carbon atoms, providing more electrons for the electron transport chain

Question 10

Which of the following is a key regulatory mechanism for pyruvate dehydrogenase during pyruvate processing?

Accepted Answer

Inhibition by phosphorylation when NADH or acetyl-CoA levels are high

Question 11

A mutation prevents the formation of oxaloacetate in the citric acid cycle. What is the most immediate consequence for cellular respiration?

Accepted Answer

Acetyl-CoA cannot enter the citric acid cycle, halting ATP and NADH production from this pathway

Question 12

Which of the following equations correctly represents the overall reaction for aerobic cellular respiration?

Accepted Answer

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

Question 13

Which of the following best describes the role of the proton-motive force in ATP synthesis?

Accepted Answer

It drives protons through ATP synthase, causing conformational changes that catalyze ATP formation from ADP and $$P_i$$

Question 14

If a cell is exposed to a compound that inhibits ATP synthase, what would be the most immediate effect on cellular respiration?

Accepted Answer

ATP production by oxidative phosphorylation would decrease dramatically

Question 15

Which of the following statements about fermentation is FALSE?

Accepted Answer

Fermentation produces more ATP per glucose than aerobic respiration

Question 16

A scientist inhibits a key enzyme in the alternative energy pathway that uses alanine in liver cancer cells. What is the most likely effect on the cancer cells?

Accepted Answer

Reduced growth due to decreased ATP production from alanine metabolism

Question 17

Which of the following best explains why oxygen is such an effective final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen is highly electronegative, allowing a large release of energy when electrons are transferred to it

Question 18

Which of the following is a correct statement about the fate of pyruvate in eukaryotic cells under aerobic conditions?

Accepted Answer

Pyruvate is transported into the mitochondria and converted to acetyl-CoA

Question 19

Which of the following best describes the difference between catabolic and anabolic pathways in metabolism?

Accepted Answer

Catabolic pathways break down molecules to release energy, while anabolic pathways use energy to build larger molecules

Cellular Respiration and Fermentation: Chapter 9 Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드