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The enzyme that catalyses the very first step of glycolysis is:
AThe aldolase
BThe isomerase
CThe hexokinase
DPyruvate kinase
Answer & Solution
Correct answer: C. The hexokinase
1. The first step traps glucose in the cell by adding a phosphate to it.
2. The enzyme responsible acts on six-carbon sugars generally.
3. The first step in glycolysis is catalyzed by hexokinase, an enzyme with broad specificity that catalyzes the phosphorylation of six-carbon sugars.
4. Aldolase acts at step four and pyruvate kinase at the very last step.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 7 'Cellular Respiration', sections 7.1-7.7_
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