Cellular Respiration And Metabolic Pathways Practice Test Practice Tests

Question 1

In the reaction $CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$, which molecule is being oxidized?

Accepted Answer

CH4

Answer

O2

Answer

CO2

Answer

H2O

Question 2

If the $\Delta G$ for a reaction is -140 kcal/mol, how much ATP (in moles) can theoretically be produced, assuming each mole of ATP requires 7 kcal/mol?

Accepted Answer

20

Question 3

During glycolysis, how many net ATP molecules are produced per molecule of glucose?

Accepted Answer

2

Answer

0

Answer

4

Answer

36

Question 4

The electron transport chain directly produces ATP through substrate-level phosphorylation.

Accepted Answer

True

Answer

False

Question 5

Which of the following are products of glycolysis from one molecule of glucose?

Answer

1 Pyruvate

Answer

2 Pyruvate

Answer

4 ATP (net)

Answer

2 ATP (net)

Answer

1 NADH

Answer

2 NADH

Question 6

Calculate the number of NADH molecules produced when 5 molecules of glucose undergo glycolysis.

Accepted Answer

10

Question 7

During pyruvate oxidation, calculate the number of NADH molecules produced from 5 molecules of pyruvate.

Accepted Answer

5

Question 8

If the citric acid cycle starts with 3 molecules of acetyl CoA, how many molecules of CO2 will be released after two complete turns of each acetyl CoA?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 9

In the citric acid cycle, how many GTP molecules are produced per acetyl CoA molecule?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 10

If 10 NADH molecules and 2 FADH2 molecules enter the electron transport chain, and assuming each NADH yields 2.5 ATP and each FADH2 yields 1.5 ATP, calculate the total ATP produced.

Accepted Answer

28

Question 11

What is the primary role of the proton gradient established across the inner mitochondrial membrane during oxidative phosphorylation?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 12

Chemiosmosis directly involves the oxidation of NADH and FADH2 to generate ATP.

Accepted Answer

True

Answer

False

Question 13

Which of the following are components of the electron transport chain?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 14

If the complete oxidation of glucose yields a theoretical maximum of 32 ATP molecules, and the energy stored in ATP is approximately 7.3 kcal/mol, calculate the total energy stored in ATP from one mole of glucose, in kcal.

Accepted Answer

233.6

Question 15

In anaerobic respiration using sulfate as the final electron acceptor, how many moles of ATP are produced per mole of glucose, assuming the proton-motive force is efficiently utilized and the $\Delta G^\circ$ for ATP synthesis is -30.5 kJ/mol?

Accepted Answer

A. Approximately 2 ATP

Answer

B. Approximately 38 ATP

Answer

C. Approximately 30 ATP

Answer

D. Approximately 10 ATP

Question 16

A yeast culture is fermenting glucose under anaerobic conditions. If the initial glucose concentration is 200 mM and the final ethanol concentration is 380 mM, calculate the percentage of glucose converted to ethanol, assuming the stoichiometry of alcohol fermentation is 1:2 (1 glucose yields 2 ethanol).

Accepted Answer

95%

Question 17

Which of the following statements accurately describe differences between alcohol fermentation and lactic acid fermentation?

Answer

A. Alcohol fermentation produces CO2 as a byproduct, while lactic acid fermentation does not.

Answer

B. Lactic acid fermentation regenerates NAD+ by oxidizing ethanol, while alcohol fermentation reduces pyruvate.

Answer

C. Alcohol fermentation involves the conversion of pyruvate to acetaldehyde before reduction, while lactic acid fermentation directly reduces pyruvate.

Answer

D. Both processes produce the same amount of ATP per glucose molecule.

Question 18

If a cell catabolizes 10 grams of fat (average molecular weight 800 g/mol) via beta-oxidation, and each mole of fat yields 100 moles of ATP, how many grams of glucose (molecular weight 180 g/mol) would need to be catabolized to produce the same amount of ATP, assuming glucose yields 32 ATP per mole?

Accepted Answer

C. 56.25 grams

Answer

A. 3.6 grams

Answer

B. 18 grams

Answer

C. 7.03 grams

Answer

D. 112.5 grams

Question 19

Anabolic pathways always require energy input, typically in the form of ATP, to synthesize complex molecules from simpler precursors.

Accepted Answer

True

Answer

False

Question 20

If the concentration of ATP in a cell increases significantly, which of the following is most likely to occur regarding phosphofructokinase (PFK) activity, and what is the underlying mechanism?

Accepted Answer

B. PFK activity decreases due to allosteric inhibition by ATP.

Answer

A. PFK activity increases due to competitive activation by ATP.

Answer

C. PFK activity remains unchanged as ATP does not regulate PFK.

Answer

D. PFK activity increases due to increased substrate availability.

Cellular Respiration And Metabolic Pathways Practice Test Practice Tests

Practice Tests

Cellular Respiration and Metabolic Pathways Practice Test

Generate Cellular Respiration And Metabolic Pathways Practice Test practice tests with AI