The reaction ADP + Pi ⟶ ATP - VCE - SSCE Biology - Question 20 - 2011 - Paper 1
Question 20
The reaction ADP + Pi ⟶ ATP.
A. is irreversible.
B. occurs without the presence of enzymes.
C. occurs in yeast cells during fermentation.
D. only occurs in cells con... show full transcript
Worked Solution & Example Answer:The reaction ADP + Pi ⟶ ATP - VCE - SSCE Biology - Question 20 - 2011 - Paper 1
Step 1
A. is irreversible.
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Answer
This statement is false. The reaction forming ATP from ADP and inorganic phosphate (Pi) is reversible, as ATP can be hydrolyzed back to ADP and Pi.
Step 2
B. occurs without the presence of enzymes.
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Answer
This statement is false. The synthesis of ATP from ADP and Pi typically requires enzyme activity, specifically through ATP synthase in biological systems.
Step 3
C. occurs in yeast cells during fermentation.
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Answer
This statement is true. The reaction does occur in yeast cells during fermentation, particularly in the process of anaerobic respiration where ATP is generated.
Step 4
D. only occurs in cells containing mitochondria.
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Answer
This statement is false. While mitochondria are essential for aerobic respiration and ATP synthesis under those conditions, the formation of ATP from ADP and Pi can also occur in cells that do not contain mitochondria, like yeast during fermentation.
