Question

multiple select question
select all that apply
which glycolytic reactions produce g3p?

2
1
4
3
5

Explanation:

Identify the reactions of the energy investment phase of glycolysis

The first five steps of glycolysis are:

1. Glucose + ATP $

ightarrow$ Glucose-6-phosphate + ADP (Hexokinase)

1. Glucose-6-phosphate $

ightleftharpoons$ Fructose-6-phosphate (Phosphoglucose isomerase)

1. Fructose-6-phosphate + ATP $

ightarrow$ Fructose-1,6-bisphosphate + ADP (Phosphofructokinase-1)

1. Fructose-1,6-bisphosphate $

ightleftharpoons$ Dihydroxyacetone phosphate (DHAP) + Glyceraldehyde-3-phosphate (G3P) (Aldolase)

1. DHAP $

ightleftharpoons$ G3P (Triose phosphate isomerase)

Determine which reactions produce G3P

• Reaction 4 (catalyzed by aldolase) cleaves fructose-1,6-bisphosphate into one molecule of G3P and one molecule of DHAP.
• Reaction 5 (catalyzed by triose phosphate isomerase) isomerizes DHAP into a second molecule of G3P.
• Therefore, reactions 4 and 5 produce G3P.

Answer:

• 2
• 1
• 4 (Correct answer)
• 3
• 5 (Correct answer)