Question

$3$-PGA is first stable product ill

• A. carbon-reduction cycle
• B. OAA
• C. malic acid
• D. PEP

Answer 1

Answer: (A)

carbon-reduction cycle

Answer 2

$3$-phosphoglyceric acid $(3PGA)$ is the first stable product of Calvin-Bensen cycle or $C_{3}$ cycle. Oxaloacetic acid (OAA) is first stable product of Hatch-Slack cycle or $C_{4}$-cycle. Malic acid is produced in bundle sheath cells from $OAA$ in $C_{4}$ cycle. Phosphoenol pyruvic acid (PEP) is the first $C O_{2}$ acceptor in $C_{4}$-cycle.