Question

multiple choice question

the second half of glycolysis:

generates atp.
consumes atp and generates atp.
consumes atp and produces adp.
requires atp.

Explanation:

Analyze the energy investment phase of glycolysis

The first half of glycolysis (steps 1–5) is the energy investment phase, which consumes 2 molecules of ATP to phosphorylate glucose and its derivatives.

Analyze the energy payoff phase of glycolysis

The second half of glycolysis (steps 6–10) is the energy payoff phase, where the two 3-carbon molecules (G3P) are oxidized, generating 4 molecules of ATP and 2 molecules of NADH. No ATP is consumed in this phase.

Evaluate the given options

• "generates ATP": Correct, because the second half produces ATP via substrate-level phosphorylation without consuming any.
• "consumes ATP and generates ATP": Incorrect, ATP is only consumed in the first half.
• "consumes ATP and produces ADP": Incorrect, ATP is not consumed here.
• "requires ATP": Incorrect, the second half does not require ATP input.

Answer:

• generates ATP. (Correct answer)
• consumes ATP and generates ATP.
• consumes ATP and produces ADP.
• requires ATP.