AQA A-Level PE Energy Systems Practice Exam

Stored fat is broken down into glycerol and free fatty acids for transport by the blood. What are the products?

Glycerol and free fatty acids Amino acids Glucose Ketone bodies

Correct Answer:

Glycerol and free fatty acids

Explanation:

When stored fat is broken down, triglycerides in adipose tissue are cleaved into glycerol and free fatty acids. Glycerol is released into the bloodstream and travels to the liver where it can enter glycolysis or gluconeogenesis. The free fatty acids are carried in the blood bound to albumin and are delivered to tissues for beta-oxidation to produce acetyl-CoA and energy. Amino acids and glucose are produced from protein and carbohydrate metabolism, not directly from lipolysis, and ketone bodies are formed from acetyl-CoA mainly during prolonged fasting, not as immediate products of the fat-breaking process.

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