Which enzyme catalyses the seventh step of glycolysis, in which 1,3-bisphosphoglycerate donates a phosphate to adenosine diphosphate?
AThe enzyme pyruvate kinase
BThe enzyme phosphofructokinase
CThe enzyme phosphoglycerate kinase
DThe enzyme pyruvate decarboxylase
Answer & Solution
Correct answer: C. The enzyme phosphoglycerate kinase
1. Step seven takes the high-energy phosphate from 1,3-bisphosphoglycerate and puts it onto adenosine diphosphate.
2. The enzyme is phosphoglycerate kinase, named for the reverse reaction.
3. One molecule of adenosine triphosphate is formed, which is an example of substrate-level phosphorylation.
4. The carbonyl group on 1,3-bisphosphoglycerate is oxidized to a carboxyl group and 3-phosphoglycerate is formed.
5. Pyruvate kinase runs the tenth step, so it is the trap for anyone who remembers only that a kinase makes adenosine triphosphate here.
6. Pyruvate decarboxylase belongs to alcohol fermentation and is not a glycolytic enzyme at all.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.2 Glycolysis_
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