Lipids can be used by cells to generate ATP via a process known as beta-oxidationTrue/False
A
True
B
False

Question

Lipids can be used by cells to generate ATP via a process known as beta-oxidation

BlackTom AI · Accepted Answer

Fatty acids undergo beta-oxidation to generate acetyl-CoA, NADH and FADH2, which are used to produce ATP via the citric acid cycle and oxidative phosphorylation.

1. Relevant knowledge points and concepts
- Lipids (mainly triglycerides) are hydrolyzed to glycerol and free fatty acids.
- Fatty acids are activated to fatty acyl-CoA (costing ATP equivalents), transported into the mitochondrial matrix (carnitine shuttle for long-chain fatty acids).
- Beta-oxidation is a cyclic mitochondrial process that removes two-carbon acetyl-CoA units per cycle, producing one NADH and one FADH2 per cycle.
- Acetyl-CoA enters the citric acid cycle (TCA), generating more NADH, FADH2 and GTP; these reduced cofactors fuel oxidative phosphorylation to make ATP.

2. Step-by-step reasoning
- A fatty acid of even carbon length is shortened by repeated cycles: each cycle yields 1 NADH, 1 FADH2 and 1 acetyl-CoA (except the final step which yields two acetyl-CoA).
- The acetyl-CoA molecules enter the TCA cycle, producing reduced cofactors that are converted to ATP by the electron transport chain.
- Activation of the fatty acid (to acyl-CoA) uses ATP → AMP (equivalent to 2 ATP).

3. Calculations with intermediate steps (example: palmitate, 16 carbons)
- Number of acetyl-CoA produced = 16/2 = 8.
- Number of beta-oxidation cycles = 8 − 1 = 7.
- Cofactors from beta-oxidation: 7 NADH and 7 FADH2.
- ATP equivalents: each NADH ≈ 2.5 ATP, each FADH2 ≈ 1.5 ATP.
- ATP from beta-oxidation cofactors = 7×2.5 + 7×1.5 = 17.5 + 10.5 = 28.
- ATP from TCA (per acetyl-CoA) ≈ 10 ATP → 8×10 = 80.
- Subtract activation cost 2 ATP → Total = 80 + 28 − 2 = 106 ATP (net).

4. Why the correct answer is correct
- Beta-oxidation is the canonical pathway by which fatty acids are catabolized to yield acetyl-CoA and reduced cofactors, which are ultimately converted into ATP; the calculation above demonstrates the substantial ATP yield from lipid oxidation.

5. Why the other option (False) is incorrect
- Answering False would deny the well-established biochemical pathway: lipids are indeed metabolized via beta-oxidation to produce ATP, so False contradicts core metabolic biochemistry.

6. Conclusion
- The correct answer is True, consistent with the biochemical pathway and the quantitative ATP yield shown.

Lipids can be used by cells to generate ATP via a process known as beta-oxidationTrue/False

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