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Which of the following is a 4-carbon compound?

  • (a) 3-phosphoglyceric acid Your answer
  • (b) ribulose bisphosphate Your answer
  • (c) oxaloacetic acid Correct
  • (d) phosphoenol pyruvate Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

Oxaloacetic acid (OAA) is a 4-carbon acid, the first product of C4 fixation.

Why the other options are wrong

  • (a) · your answer 3-PGA has 3 carbons.
  • (b) · your answer RuBP has 5 carbons.
  • (d) · your answer PEP has 3 carbons.
NCERT point: OAA is converted to other C4 acids such as malic acid or aspartic acid.
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