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Course: AQA A Level Biology 7402
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AQA A Level Biology 7402

1. Biological Molecules

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2. Cell Structure

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3. Exchange and Transport

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4. Genetics, Variation and Interdependence

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5. Energy Transfers In and Between Organisms (A Level only)

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6. Organisms Respond to Changes in their Environments (A Level only)

0/93

7. Genetics, Populations, Evolution and Ecosystems (A Level only)

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8. The Control of Gene Expression (A Level only)

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9. Exam Guidance and Skills

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Quiz

5.2.5 The Krebs Cycle – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.
Which molecule combines with the acetyl group at the start of the Krebs cycle?
Oxaloacetate
Citrate
Pyruvate
Coenzyme A
2.
How many turns of the Krebs cycle occur per glucose molecule?
1
2
3
6
3.
This organelle is the host for the Krebs cycle and oxidative phosphorylation of respiration.
This organelle is the host for the Krebs cycle and oxidative phosphorylation of respiration.
Cell wall
Mitochondrion
Ribosome
Lysosome
Golgi apparatus
4.
In the sequence covered in this lesson, which step comes immediately after Krebs cycle?
In the sequence covered in this lesson, which step comes immediately after Krebs cycle?
Pyruvate
Glycolysis
ETC
NADH/FADH₂
5.
In the sequence covered in this lesson, which step comes immediately after Krebs cycle (CO₂)?
In the sequence covered in this lesson, which step comes immediately after Krebs cycle (CO₂)?
Glucose
~34 ATP + H₂O
Glycolysis (2 ATP)
ETC
6.
Which statement best describes Krebs cycle?
Which statement best describes Krebs cycle?
In matrix; makes NADH, FADH₂, CO₂, ATP.
Pyruvate → acetyl-CoA + CO₂.
Oxygen, forming water.
Electron carriers.
7.
According to the comparison table in this lesson, what is the Input of Krebs cycle?
According to the comparison table in this lesson, what is the Input of Krebs cycle?
Stages of cellular respiration
2 pyruvate
2 acetyl-CoA
Glucose
NADH, FADH₂, O₂
8.
According to the comparison table in this lesson, what is the Output of Krebs cycle?
According to the comparison table in this lesson, what is the Output of Krebs cycle?
Stages of cellular respiration
4 CO₂, 6 NADH, 2 FADH₂
Lactate or ethanol + CO₂, NAD⁺
H₂O
2 acetyl-CoA, 2 CO₂, 2 NADH
9.
Where does glycolysis take place?
Mitochondrial matrix
Cytoplasm
Inner mitochondrial membrane
Intermembrane space
10.
What is the net ATP yield of glycolysis per glucose?
1
4
2
36
11.
Which of these is produced in the link reaction?
ATP
Reduced FAD
Oxaloacetate
Carbon dioxide
12.
Without oxygen, the Krebs cycle keeps running normally. True or false?
True
True in muscle
False
True for a few hours
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Part of 5. Energy Transfers In and Between Organisms (A Level only) — see every lesson and quiz in this unit.
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