Complete the chart :[Chart: three boxes at the top — ‘Lipids’, ‘Carbohydrates’, ‘Proteins’. Lipids → box a; Carbohydrates → ‘Glycolysis’ → box c → box d → box e → box f. Proteins → box b, and the arrows from a and b join box d.]

Answer: a — fatty acids and glycerol; b — amino acids; c — pyruvic acid; d — acetyl CoA; e — Kreb’s cycle; f — energy (ATP) with CO₂ and water.

Carbohydrates are broken into glucose, which is converted into pyruvic acid by glycolysis in the cytoplasm. Pyruvic acid enters the mitochondrion and becomes acetyl CoA, which enters the Kreb’s cycle and is oxidised to CO₂ and water with the release of energy. Fats are digested into fatty acids and glycerol, and proteins into amino acids; both are converted into acetyl CoA and enter the same Kreb’s cycle.