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MHT CET 202623 AprilEvening Shift
Exam
MHT CET
Year
2026
Date
23 April
Shift
Evening Shift
Subject
Biology
Chapter
Respiration in Plants

MHT CET 2026 · 23 April · Evening Shift · Biology · Respiration in Plants

Identify the step, in which phosphorylation occurs with the help of...

Identify the step, in which phosphorylation occurs with the help of inorganic phosphate and not ATP.

Options

  1. AGlucose (6C) 1M \rightarrow Glucose -6- phosphate (6C) 1M
  2. BGlyceraldehyde-3-phosphate (3C) \rightarrow 1,3 bisphosphoglycerate (3C)
  3. C2 Phosphoenol pyruvate (3C) \rightarrow Pyruvic acid (3C)
  4. D1,3 bisphosphoglycerate (3C) \rightarrow 3 Phosphoglycerate (3C)

Correct answer

B. Glyceraldehyde-3-phosphate (3C) \rightarrow 1,3 bisphosphoglycerate (3C)

Step-by-step solution

In glycolysis, the conversion of Glyceraldehyde-3-phosphate to 1,3-bisphosphoglycerate is catalyzed by the enzyme glyceraldehyde-3-phosphate dehydrogenase.

During this step, oxidation of Glyceraldehyde-3-phosphate occurs, and inorganic phosphate (H_3PO_4ororP_i)isaddedtoform1,3−bisphosphoglycerate.ATPisnotutilizedinthisphosphorylationstep.<br><br>IntheconversionofGlucosetoGlucose−6−phosphate,ATPisusedasthephosphatedonor.<br><br>Intheconversionsof1,3−bisphosphoglycerateto3−phosphoglycerateandPhosphoenolpyruvatetoPyruvicacid,ATPissynthesized(substrate−levelphosphorylation).<br><br>Answer:Glyceraldehyde−3−phosphate(3C)→1,3bisphosphoglycerate(3C)) is added to form 1,3-bisphosphoglycerate. ATP is not utilized in this phosphorylation step.<br><br>In the conversion of Glucose to Glucose-6-phosphate, ATP is used as the phosphate donor.<br><br>In the conversions of 1,3-bisphosphoglycerate to 3-phosphoglycerate and Phosphoenol pyruvate to Pyruvic acid, ATP is synthesized (substrate-level phosphorylation).<br><br>Answer: Glyceraldehyde-3-phosphate (3C) \rightarrow 1,3 bisphosphoglycerate (3C)
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