Question 1

Which of the following statements about metabolic pathways is correct?

Accepted Answer

A metabolic pathway may be cyclic or linear, and involves a series of reactions catalyzed by enzymes.

Question 2

Which of the following is the correct skeletal equation for the hydrolysis of ATP?

Accepted Answer

$$ \mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i $$

Question 3

During the citric acid cycle, which step involves the production of carbon dioxide?

Accepted Answer

Conversion of isocitrate to α-ketoglutarate

Question 4

Which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

O$$_2$$

Question 5

How many NADH and FADH$$_2$$ molecules are produced per turn of the citric acid cycle?

Accepted Answer

Three NADH and one FADH$$_2$$

Question 6

Which of the following citric acid cycle intermediates is NOT a C$$_4$$ species?

Accepted Answer

Citrate

Question 7

Which electron carrier is NOT part of a membrane-bound protein complex in the electron transport chain?

Accepted Answer

CoQ

Question 8

What is the total number of ATP molecules produced from the complete oxidation of one molecule of glucose via glycolysis, citric acid cycle, and electron transport chain (assuming maximum yield)?

Accepted Answer

38

Question 9

Which of the following statements about oxidative phosphorylation is correct?

Accepted Answer

It is the process in which ATP is synthesized using energy from the dissipation of a proton gradient.

Question 10

Which of the following is the correct designation for the reduced form of nicotinamide adenine dinucleotide?

Accepted Answer

$$ \mathrm{NADH} $$

Question 11

Which of the following citric acid cycle reactions involves the coenzyme FAD?

Accepted Answer

Oxidation of succinate to fumarate

Question 12

Which of the following statements about the mitochondrial membrane is correct?

Accepted Answer

The inner membrane is less permeable than the outer membrane.

Question 13

Which of the following is a product of the citric acid cycle?

Accepted Answer

CO$$_2$$ and NADH

Question 14

Which of the following statements about ATP is correct?

Accepted Answer

ATP contains two high-energy phosphate bonds between the β and γ phosphates.

Question 15

Which of the following electron carriers interacts with molecular oxygen in the electron transport chain?

Accepted Answer

Cytochrome a$$_3$$

Question 16

Which of the following citric acid cycle intermediates is decarboxylated during the operation of the cycle?

Accepted Answer

Isocitrate

Question 17

Which of the following statements concerning the electron transport chain is correct?

Accepted Answer

Electrons are transferred from NADH and FADH$$_2 to O$_2$$ via a series of protein complexes.

Question 18

Which of the following is a correct description of the reaction that occurs in the first step of the citric acid cycle?

Accepted Answer

$$ \mathrm{C}_2 + \mathrm{C}_4 \rightarrow \mathrm{C}_6 $$

Question 19

Which of the following statements about the role of NAD$$^+ in $$metabolism is correct?

Accepted Answer

NAD$$^+$$ acts as an oxidizing agent, accepting electrons during catabolic reactions.

Question 20

Which of the following statements about the production of ATP in the electron transport chain is correct?

Accepted Answer

ATP is produced as protons flow back into the mitochondrial matrix through ATP synthase.

Chapter 23

Guida di studio - Domande di pratica

Study guide - Flashcard