10 questions🇬🇧English
🔋 Aerobic Respiration – A-level
Biology · A-level — practises glycolysis, the Krebs cycle and oxidative phosphorylation
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Questions
In which part of the cell does glycolysis take place?
Cytoplasm
Inner mitochondrial membrane
Mitochondrial matrix
Intermembrane space
20s
What is the final electron acceptor in the electron transport chain of aerobic respiration?
NAD
Pyruvate
Carbon dioxide
Oxygen
20s
What is the net yield of ATP from glycolysis for one molecule of glucose?
2
4
1
6
20s
Where in the mitochondrion is ATP synthase located?
Intermembrane space
Mitochondrial matrix
Outer mitochondrial membrane
Inner mitochondrial membrane
20s
In the link reaction, pyruvate is converted into acetyl coenzyme A. What else is produced per pyruvate?
One CO₂ and one reduced NAD
One ATP and one reduced NAD
Two CO₂ and one ATP
One CO₂ and one reduced FAD
30s
At the start of the Krebs cycle, acetyl coenzyme A combines with which 4-carbon compound?
Pyruvate
Oxaloacetate
Ribulose bisphosphate
Citrate
30s
How many molecules of reduced NAD are produced in one turn of the Krebs cycle?
1
3
2
4
20s
Energy from electrons is used to pump H⁺ ions across the inner mitochondrial membrane. Where do H⁺ ions build up?
Intermembrane space
Mitochondrial matrix
Cytoplasm
Thylakoid space
30s
Cyanide inhibits the final carrier in the electron transport chain. Why does the Krebs cycle also stop?
Reduced NAD is not reoxidised, so oxidised NAD runs out
Pyruvate can no longer form in the cytoplasm
Oxygen can no longer diffuse into the matrix
ATP synthase makes too much ATP
30s
Using 2.5 ATP per reduced NAD and 1.5 per reduced FAD, how many ATP come from oxidative phosphorylation for one Krebs cycle turn?
7.5
10
9
11
30s