Question

In the C4 pathway, which of the following molecules combines with carbon dioxide?
a) Glyceraldehyde phosphate b) ribulose bisphosphate c) Phosphorene pyruvic acid
d) Citric acid​

Answer 1

Answer:

C) Phosphorene pyruvic acid

Explanation:

Phosphoenolpyruvate carboxylase, an enzyme found in all multicellular plants, catalyses the formation of oxaloacetate from phosphoenolpyruvate (PEP) and a hydrocarbonate ion. This reaction is harnessed by C4 plants to capture and concentrate carbon dioxide into the photosynthetic bundle sheath cells.

Answer 2

Question:

In the C4 pathway, which of the following molecules combines with carbon dioxide?

a) Glyceraldehyde phosphate.

b) Ribulose bisphosphate.

c) Phosphorene pyruvic acid.

d) Citric acid​.

Concept:

C4 Pathway Hatch-Slack pathway)- A pathway for initial carbon fixation. This pathway is specially designed for fixing CO₂ at low concentration. The plants which uses C4 pathway are named as C4 plants.

Answer and explanation:

In the C4 pathway, which of the following molecules combines with carbon dioxide?

c) Phosphorene pyruvic acid.

CO₂ combines first with phosphoenolpyruvic acid or PEP to form a four-carbon molecule, Oxaloacetatic acid.

So option (c) is the correct answer.

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