BIO024 - SAS 7 QUIZ
Question 1
The Krebs cycle occurs in which part of the mitochondria
Outer membrane
Inner membrane
Matrix
Intermembrane space
Question 2
The first molecule formed in the Krebs cycle is:
Malate
Citrate
Oxaloacetate
Succinyl-CoA
Question 3
Acetyl-CoA combines with which molecule to form citrate?
Pyruvate
Succinate
Oxaloacetate
Fumarate
Question 4
The enzyme that converts citrate to isocitrate:
Aconitase
Citrate synthase
Isocitrate dehydrogenase
Malate Dehydrogenase
Question 5
How many NADH molecules are produced per turn the Krebs cycle?
1
2
3
4
Question 6
Which of the following reactions in the Krebs cycle directly produces cycle produces ATP (or GTP)?
Succinate > Fumarate
Succinyl-CoA > Succinate
Alpha-ketoglutarate > Succinyl-CoA
Isocitrate > Alpha-ketoglutarate
Question 7
Which molecule is regenerated at the end of the Krebs cycle?
Citrate
Malate
Oxaloacetate
Fumarate
Question 8
The main purpose of the krebs cycle is to:
Breakdown glucose completely
Produce oxygen
Generate high-energy electron carriers
Store glycogen
Question 9
How many ATP molecules are produced per acetyl-CoA oxidized in the Krebs Cycle?
10
12
1
2
Question 10
In the electron transport chain, which molecules serves as the final electron acceptor?
NAD+
FAD
Oxygen
Carbon Dioxide
Question 11
If a poison blocks Complex IV in the ETC, What would happen?
ATP production would increase
NADH would accumulate
Oxygen consumption would rise
Electron flow would continue to flow normally
Question 12
Why is FADH2 less efficient than NADH in generating ATP?
It carries fewer electrons
It enters the ETC later, bypassing complex I
It reacts slower with oxygen
It has a higher reduction potential
Question 13
A mutation inhibits succinate dehydrogenase. Which two pathways would be affected?
Glycolysis and Krebs cycle
Krebs cycle and ETC
Glycolysis and ETC
Krebs cycle and Gluconeogenesis
Question 14
If oxygen is unavailable, what happens to the Krebs cycle?
It speeds up
It continues by using lactic acid
Its stops due to the lack of NAD+
It produces more CO2
Question 15
Which of the following best explains the role of the proton gradient in the ETC?
It provides electron for ATP synthesis
It drives ATP synthesis via ATP synthase
It oxidizes NADH
It transports electron to oxygen
Question 16
Which of the following directly links the Krebs cycle and the ETC?
Citrate
NADH and FAD2
Acetyl-CoA
ATP
Question 17
The process that converts the energy of electron into ATP is called:
substrate level phosphorylation
Oxidative phosphorylation
Reductive phosphorylation
Photophosphorylation
Question 18
Which step of the Krebs cycle involves decarboxylation and oxidation simultaneously?
Citrate to isocitrate
Isocitrate to alpha keto glutarate
Fumarate to malate
Succinate to Fumarate
Question 19
Which specific steps of the Krebs cycle is NADH produced?
Steps 1,3 and 7
Steps 2,4 and 6
Steps 2,3 and 7
Steps 3,5 snd 6
Question 20
Which organelle is primarily responsible for producing ATP through the Krebs cycle and ETC
The process of breaking down glucose to produce carbon dioxide only
The conversion of sunlight energy into glucose molecules
The breakdown of food molecules to release energy to form ATP
The process by which glucose is converted to ATP and oxygen