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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

7.2.4 Link Reaction and 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.
Which of these is produced in the link reaction?
ATP
Reduced FAD
Oxaloacetate
Carbon dioxide
4.

The link reaction and Krebs cycle take place in the

cytoplasm
inner membrane
mitochondrial matrix
intermembrane space
5.
Where does glycolysis take place?
Mitochondrial matrix
Cytoplasm
Inner mitochondrial membrane
Intermembrane space
6.
What is the net ATP yield of glycolysis per glucose?
1
4
2
36
7.
Why is glucose phosphorylated at the start of glycolysis?
To make it more reactive and less able to leave the cell
To release energy as ATP
To remove carbon dioxide
To reduce NAD
8.
Which statement best describes Acetyl coenzyme A?
A three-carbon compound that is the end product of glycolysis.
A two-carbon acetyl group carried by coenzyme A that delivers carbon into the Krebs cycle.
The conversion of pyruvate to acetyl coenzyme A in the mitochondrial matrix, releasing CO2 and reducing NAD.
The splitting of one glucose molecule into two pyruvate molecules in the cytoplasm, with a small net yield of ATP and reduced NAD.
9.
Which statement best describes Dehydrogenation?
Direct formation of ATP by transfer of a phosphate group from a substrate molecule to ADP.
The removal of hydrogen atoms from a substrate by dehydrogenase enzymes, which pass them to NAD or FAD.
The removal of carbon dioxide from a molecule, catalysed by decarboxylase enzymes.
The conversion of pyruvate to acetyl coenzyme A in the mitochondrial matrix, releasing CO2 and reducing NAD.
10.
Which statement best describes Substrate-level phosphorylation?
The conversion of pyruvate to acetyl coenzyme A in the mitochondrial matrix, releasing CO2 and reducing NAD.
A three-carbon compound that is the end product of glycolysis.
The removal of carbon dioxide from a molecule, catalysed by decarboxylase enzymes.
Direct formation of ATP by transfer of a phosphate group from a substrate molecule to ADP.
11.
Which statement best describes Triose phosphate (TP)?
A three-carbon compound that is the end product of glycolysis.
A three-carbon phosphorylated sugar formed when hexose bisphosphate is split in glycolysis.
The conversion of pyruvate to acetyl coenzyme A in the mitochondrial matrix, releasing CO2 and reducing NAD.
The removal of carbon dioxide from a molecule, catalysed by decarboxylase enzymes.
12.
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
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Part of Topic 7 · Run for your Life — see every lesson and quiz in this unit.
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