Q: Which of the following is the correct overall reaction for the Krebs cycle per acetyl CoA?

$$\text{Acetyl CoA} + 3 NAD^+ + FAD + ADP + P_i + 3 H_2O \rightarrow 2 CO_2$ + 3 NADH + 3 H^+ + $$FADH_2$$ + ATP + \text{CoA}$$

Question 1

Which of the following best describes the overall chemical reaction for aerobic glucose oxidation in human cells?

Accepted Answer

$$C_6H_{12}O_6$ + 6 O_2$ \rightarrow 6 CO_2$ + 6 H_2O + ATP$$

Question 2

During cellular respiration, what percentage of the energy released from glucose oxidation is captured in ATP, and what happens to the rest?

Accepted Answer

33% is captured in ATP; 67% is lost as body heat

Question 3

If one mole of glucose is completely oxidized in a human cell, how many moles of ATP are produced?

Accepted Answer

32 moles

Question 4

Which process directly produces ATP by substrate-level phosphorylation during glucose metabolism?

Accepted Answer

Glycolysis and Krebs cycle

Question 5

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

Accepted Answer

2 ATP

Question 6

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

Accepted Answer

Oxygen ($$O_2)$$

Question 7

During the conversion of pyruvate to acetyl CoA, which of the following is produced per pyruvate molecule?

Accepted Answer

1 NADH + 1 CO$$_2$$

Question 8

Which of the following is the correct overall reaction for the Krebs cycle per acetyl CoA?

Accepted Answer

$$	ext{Acetyl CoA} + 3 NAD^+ + FAD + ADP + P_i + 3 H_2O ightarrow 2 CO_2$ + 3 NADH + 3 H^+ + $$FADH_2$$ + ATP + 	ext{CoA}$$

Question 9

Which step in cellular respiration occurs in the cytosol?

Accepted Answer

Glycolysis

Question 10

A patient has a mitochondrial disorder that impairs oxidative phosphorylation. Which of the following would most likely be observed?

Accepted Answer

Decreased ATP production and increased lactic acid

Question 11

Which of the following best explains why body heat is produced during glucose oxidation?

Accepted Answer

Not all energy from glucose is captured in ATP; the remainder is released as heat

Question 12

If a cell uses 1 mole of glucose and produces 32 moles of ATP, how much energy is stored in ATP if each mole of ATP stores 7 kcal?

Accepted Answer

$$32 	imes 7 = 224$$ kcal

Question 13

Which of the following is a reduced energy equivalent produced during glycolysis?

Accepted Answer

NADH

Question 14

Which process in cellular respiration uses oxygen directly?

Accepted Answer

Electron transport chain

Question 15

How many NADH molecules are produced from one glucose molecule during glycolysis?

Accepted Answer

2 NADH

Question 16

Which of the following is true regarding the conversion of glucose to pyruvate?

Accepted Answer

It is a 6-carbon glucose converted to two 3-carbon pyruvate molecules

Question 17

Which of the following is NOT produced during the Krebs cycle per acetyl CoA?

Accepted Answer

O$$_2$$

Question 18

Which step in glucose metabolism is unidirectional and cannot be reversed under normal physiological conditions?

Accepted Answer

Pyruvate to Acetyl CoA

Question 19

Which of the following best describes the role of coupled reactions in cellular metabolism?

Accepted Answer

Energy released from one reaction is used to drive another reaction

Question 20

A researcher measures the respiratory exchange ratio (RER) of a subject during exercise and finds it close to 1.0. What does this indicate about the substrate being metabolized?

Accepted Answer

Primarily carbohydrate (glucose) oxidation

Cellular Metabolism: ATP Synthesis and Glucose Oxidation

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드