What is the primary role of carbohydrates in cellular catabolism?
A) They are used only as an energy reserve
B) They are broken down to produce energy for cellular activities
C) They are used exclusively for protein synthesis
D) They are not involved in energy metabolism
E) They are converted into fats for storage
IMAT 2026 · Question 22
Q22 - ATP and bioenergetics
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The correct answer is B) They are broken down to produce energy for cellular activities.
Catabolism means breaking molecules down to release energy. Carbohydrates, mainly glucose, are oxidised to produce ATP through glycolysis, the Krebs cycle and oxidative phosphorylation.
A) Incorrect: “Only” makes this wrong. Glycogen and starch are reserves, but carbohydrates are above all broken down for energy.
B) Correct: Their catabolic role is to be broken down to produce ATP.
C) Incorrect: Proteins are built from amino acids, and “exclusively” is wrong anyway.
D) Incorrect: Carbohydrates are the cell’s main fuel.
E) Incorrect: Converting them into fat is storage, which belongs to anabolism, not catabolism.
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