QUESTION 1
Answer
During glycolysis, glucose is converted into:
A. Acetyl CoA
B. Pyruvate
C. Lactic Acid
D. Ethanol
QUESTION 2
Answer
Which molecule acts as the final electron acceptor in the electron transport chain?
A. Oxygen
B. NAD+
C. FAD
D. ATP
QUESTION 3
Answer
What is the primary function of the Krebs cycle?
A. ATP production
B. NADH and FADH2 production
C. Pyruvate breakdown
D. Glucose synthesis
QUESTION 4
Answer
In which part of the cell does glycolysis occur?
A. Mitochondria
B. Cytoplasm
C. Nucleus
D. Ribosome
QUESTION 5
Answer
What is the net ATP yield from one molecule of glucose during glycolysis?
A. 2 ATP
B. 4 ATP
C. 36 ATP
D. 38 ATP
QUESTION 6
Answer
a) Outline the process of glycolysis and explain its significance in energy production in the
absence of oxygen. [4]
b) Differentiate between lactic acid fermentation in muscle cells and alcohol fermentation in
yeast. [3]
QUESTION 7
Answer
a) Describe the conversion of pyruvate to acetyl CoA and its importance in the Krebs cycle.
[3]
b) Explain the role of NADH and FADH2 in the electron transport chain. [4]
QUESTION 8
Answer
a) Discuss the stages of the Krebs cycle and its significance in energy provision. [4]
b) How does chemiosmosis contribute to ATP yield during oxidative phosphorylation? [3]
QUESTION 11
Answer
Which process occurs in the absence of oxygen and results in the formation of lactic
acid?
A. Glycolysis
B. Krebs cycle
C. Lactic acid fermentation
D. Oxidative phosphorylation
QUESTION 12
Answer
What is the role of NADH and FADH2 in cell respiration?
A. They act as electron carriers to the electron transport chain.
B. They directly synthesize ATP.
C. They break down glucose.
D. They form the structure of ATP synthase.
QUESTION 13
Answer
During which stage of cell respiration is the majority of ATP produced?
A. Glycolysis
B. Krebs cycle
C. Electron transport chain and oxidative phosphorylation
D. Lactic acid fermentation
QUESTION 14
Answer
What happens to pyruvate in the presence of oxygen?
A. It forms lactic acid.
B. It is converted to acetyl CoA.
C. It undergoes alcohol fermentation.
D. It synthesizes glucose.
QUESTION 15
Answer
Which of the following processes produces ATP, NADH, and CO2?
A. Glycolysis
B. Krebs cycle
C. Electron transport chain
D. Lactic acid fermentation
QUESTION 16
Answer
a) Outline the process of oxidative phosphorylation and its role in ATP production. [4]
b) How does the structure of the mitochondrion facilitate the process of cell respiration? [3]
c) Discuss the significance of the semi-conservative nature of DNA replication. [4]
QUESTION 18
Answer
a) Explain the process of glycolysis and its significance in energy production in the absence
of oxygen. [4]
b) Describe lactic acid fermentation in muscle cells and alcohol fermentation in yeast. How
do these processes differ? [4]
c) Discuss the conversion of pyruvate to acetyl CoA and its role in the Krebs cycle. [3]
d) How does the electron transport chain contribute to ATP yield during cell respiration? [4]
QUESTION 19
Answer
a) Outline the stages of the Krebs cycle and explain its significance in energy provision. [4]
b) Discuss the role of NADH and FADH2 in cell respiration. [3]
c) How do alpha helices and beta pleated sheets contribute to the secondary structure of
proteins? [4]
d) Explain the significance of protein conformation in function and the impact of
denaturation. [4]
QUESTION 20
Answer
a) Describe the role of chemiosmosis in oxidative phosphorylation. [4]
b) How does the structure of ATP relate to its function as the energy currency of the cell? [3]
c) Discuss the interactions that contribute to the tertiary structure of proteins. [4]
d) Explain the significance of subunit assembly in the quaternary structure of proteins and
provide an example. [4]
