Question

multiple choice question

reaction ______ of glycolysis forms pepa that has a high-energy phosphate bond.

9
7
5
1

Explanation:

Identify the reaction forming PEPA

Phosphoenolpyruvate (PEPA or PEP) is formed from 2-phosphoglycerate (2-PG) by the enzyme enolase. This dehydration reaction is the ninth step of glycolysis.

Verify the step number

1. Glucose $

ightarrow$ G6P (Step 1)

1. G6P $

ightarrow$ F6P (Step 2)

1. F6P $

ightarrow$ F1,6BP (Step 3)

1. F1,6BP $

ightarrow$ DHAP + GAP (Step 4)

1. DHAP $

ightarrow$ GAP (Step 5)

1. GAP $

ightarrow$ 1,3BPG (Step 6)

1. 1,3BPG $

ightarrow$ 3PG (Step 7)

1. 3PG $

ightarrow$ 2PG (Step 8)

1. 2PG $

ightarrow$ PEP (Step 9)

1. PEP $

ightarrow$ Pyruvate (Step 10)

Thus, Reaction 9 forms PEPA.

Answer:

• 9 (Correct answer)
• 7
• 5
• 1