MCQ practice · SSC Biology Board questions · Chapter 4: Bioenergetics
How many carbons does the stable substance described in the stimulus have?
Think it through first, then pick an option.
- a 2
- b 3
- c 4
- d 5
Answer and explanation
Correct answer: c 4
Oxaloacetic acid has four carbons.
Why the other options are wrong
- a 2: Two carbons belong to acetyl Co-A; the stable substance is bigger.
- b 3: Three carbons belong to phosphoglyceric acid of the C3 cycle; the stimulus names oxaloacetic acid.
- d 5: No five-carbon compound is the first stable substance of CO2 reduction in this chapter.
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