Multiple choice Which of the following enzymes does not use Magnesium (Mg2+) cofactor? Phosphoglycerate kinase Glyceraldehyde phosphate dehydrogenase Phosphoglucoisomerase Phosphofructokinase Hexokinase Reveal answer Fill a bubble to check yourself B Correct answer Explanation This enzyme converts glyceraldehyde 3-phosphate to 1, 3-bisphosphoglycerate. Mg2+ is not required for this enzyme.