WAEC Biology 2013 Objective — Question 29

Question 29 of 60 from the West African Examinations Council (WAEC) Biology 2013 Objective paper, with the correct answer and a full explanation.

The name of the enzyme that catalyses the conversion of glucose to glucose-6-phosphate at the beginning of glycolysis is a

A. phospho-fructokinase
B. glucose isomerase
C. hexokinaseCorrect
D. glucose-6-kinase

Explanation

Phosphorylation of glucose is the first step in glycolysis. Here, glucose is converted to glucose-6-phosphate (by hexokinase). This is converted in two steps to fructose 1,6-diphosphate, and the latter splits into two 3-carbon segments, which are converted through five successive steps into molecules of pyruvic acid.

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