Question 1

During which of the following metabolic processes is most of the CO₂ from the catabolism of glucose is released?

Accepted Answer

A)  glycolysis 
B)  electron transport 
C)  oxidation of pyruvate to acetyl-CoA 
D)  the citric acid cycle 
A)  glycolysis 
B)  electron transport 
C)  oxidation of pyruvate to acetyl-CoA 
D)  the citric acid cycle

Question 2

Which of the summary statements below describes the results of the following reaction?
C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Energy

Accepted Answer

A)  C₆H₁₂O₆ is oxidised and O₂ is reduced. 
B)  O₂ is oxidised and H₂O is reduced. 
C)  CO₂ is reduced and O₂ is oxidised. 
D)  O₂ is reduced and CO₂ is oxidised. 
A)  C₆H₁₂O₆ is oxidised and O₂ is reduced. 
B)  O₂ is oxidised and H₂O is reduced. 
C)  CO₂ is reduced and O₂ is oxidised. 
D)  O₂ is reduced and CO₂ is oxidised.

Question 3

In liver cells, the inner mitochondrial membranes are about five times the area of the outer mitochondrial membranes. What purpose must this serve?

Accepted Answer

A)  It allows for an increased rate of glycolysis. 
B)  It allows for an increased rate of the citric acid cycle. 
C)  It increases the surface for oxidative phosphorylation. 
D)  It increases the surface for substrate-level phosphorylation. 
A)  It allows for an increased rate of glycolysis. 
B)  It allows for an increased rate of the citric acid cycle. 
C)  It increases the surface for oxidative phosphorylation. 
D)  It increases the surface for substrate-level phosphorylation.

Question 4

Fatty acids usually have an even number of carbons in their structures. Catabolism of fatty acids produces two-carbon fragments that are converted to acetyl CoA molecules. What is the most likely way in which these acetyl CoA molecules would be metabolised in aerobic cellular respiration?

Accepted Answer

A)  They would directly enter the electron transport chain. 
B)  They would directly enter the energy-yielding phase of glycolysis. 
C)  They would be converted to pyruvate and then undergo pyruvate oxidation upon transport into mitochondria. 
D)  They would directly enter the citric acid cycle. 
A)  They would directly enter the electron transport chain. 
B)  They would directly enter the energy-yielding phase of glycolysis. 
C)  They would be converted to pyruvate and then undergo pyruvate oxidation upon transport into mitochondria. 
D)  They would directly enter the citric acid cycle.

Question 5

Which one of the following is formed by the removal of a carbon (as CO₂) from a molecule of pyruvate?

Accepted Answer

A)  ATP 
B)  acetyl CoA 
C)  citrate 
D)  water 
A)  ATP 
B)  acetyl CoA 
C)  citrate 
D)  water

Question 6

Even though plants cells carry out photosynthesis, they still use their mitochondria for oxidation of pyruvate. Under what conditions will plant cell mitochondria be active in this process?

Accepted Answer

A)  Only in photosynthetic cells in the light, while photosynthesis occurs concurrently. 
B)  Only in cells that store glucose in the form of starch and only in the dark. 
C)  In all cells, with or without light. 
D)  In photosynthesising cells in the light, and in other cells in the dark. 
A)  Only in photosynthetic cells in the light, while photosynthesis occurs concurrently. 
B)  Only in cells that store glucose in the form of starch and only in the dark. 
C)  In all cells, with or without light. 
D)  In photosynthesising cells in the light, and in other cells in the dark.

Question 7

Which of the following statements best describes the primary role played by oxygen in cellular respiration?

Accepted Answer

A)  It yields energy in the form of ATP as it is passed down the electron transport chain. 
B)  It oxidises glucose to form two molecules of pyruvate. 
C)  It serves as an acceptor for carbon, forming CO₂ in the citric acid cycle. 
D)  It serves as the final acceptor for electrons from the electron transport chain. 
A)  It yields energy in the form of ATP as it is passed down the electron transport chain. 
B)  It oxidises glucose to form two molecules of pyruvate. 
C)  It serves as an acceptor for carbon, forming CO₂ in the citric acid cycle. 
D)  It serves as the final acceptor for electrons from the electron transport chain.

Question 8

Exposing inner mitochondrial membranes to ultrasonic vibrations will disrupt the membranes. However, the fragments will reseal "inside out". The little vesicles that result can still transfer electrons from NADH to oxygen and synthesise ATP. Which of the following statements about these inside-out membrane vesicles is true?

Accepted Answer

A)  The inside of the vesicles will become acidic when NADH is added. 
B)  The inside of the vesicles will become alkaline when NADH is added. 
C)  ATP will be produced from ADP and   i in the interior of the vesicle. 
D)  The vesicles will pump protons out of the interior of the vesicle to the exterior using energy from ATP hydrolysis. 
A)  The inside of the vesicles will become acidic when NADH is added. 
B)  The inside of the vesicles will become alkaline when NADH is added. 
C)  ATP will be produced from ADP and   i in the interior of the vesicle. 
D)  The vesicles will pump protons out of the interior of the vesicle to the exterior using energy from ATP hydrolysis.

Exam 9: Cellular Respiration and Fermentation

During which of the following metabolic processes is most of the CO₂ from the catabolism of glucose is released?

Which of the summary statements below describes the results of the following reaction? C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Energy

In liver cells, the inner mitochondrial membranes are about five times the area of the outer mitochondrial membranes. What purpose must this serve?

Fatty acids usually have an even number of carbons in their structures. Catabolism of fatty acids produces two-carbon fragments that are converted to acetyl CoA molecules. What is the most likely way in which these acetyl CoA molecules would be metabolised in aerobic cellular respiration?

Which one of the following is formed by the removal of a carbon (as CO₂) from a molecule of pyruvate?

Even though plants cells carry out photosynthesis, they still use their mitochondria for oxidation of pyruvate. Under what conditions will plant cell mitochondria be active in this process?

Which of the following statements best describes the primary role played by oxygen in cellular respiration?

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