Question 1

Which organelle is depicted in the image, and what is the primary function of the matrix region labeled within it?

Accepted Answer

Mitochondrion; the matrix is where the citric acid cycle and pyruvate oxidation take place.

Question 2

During aerobic cellular respiration, which step occurs in the region labeled 'Matrix' in the image?

Accepted Answer

Citric acid cycle (Krebs cycle)

Question 3

What is the main purpose of the citric acid cycle, which occurs in the matrix of the mitochondrion?

Accepted Answer

To produce NADH and FADH2 for use in oxidative phosphorylation

Question 4

Which of the following is a product of the citric acid cycle that occurs in the mitochondrial matrix?

Accepted Answer

NADH

Question 5

If a toxin specifically disrupted the matrix of the mitochondrion, which process would be most directly affected?

Accepted Answer

Citric acid cycle

Question 6

Which reactants enter the mitochondrial matrix to begin the citric acid cycle?

Accepted Answer

Acetyl-CoA and oxaloacetate

Question 7

What is the correct sequence of steps for aerobic cellular respiration, starting from glucose?

Accepted Answer

Glycolysis → Pyruvate oxidation → Citric acid cycle → Oxidative phosphorylation

Question 8

Which of the following best describes the role of NADH produced in the matrix during the citric acid cycle?

Accepted Answer

NADH donates electrons to the electron transport chain in the inner mitochondrial membrane.

Question 9

Which of the following equations correctly represents the overall reaction of the citric acid cycle in the mitochondrial matrix for one acetyl-CoA molecule?

Accepted Answer

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

Question 10

A mutation prevents the formation of the mitochondrial matrix. Which step of aerobic cellular respiration would be LEAST affected?

Accepted Answer

Glycolysis

Lecture 14

Guida di studio - Domande di pratica

Study guide - Flashcard