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Which one of the following statements is NOT correct ?

June 1, 2025 by rawan239

Which one of the following statements is NOT correct ?

All proteins are enzymes

Mostly enzymes are proteins

All fats are energy rich compounds

Glucose is a common carbohydrate

This question was previously asked in

UPSC NDA-1 – 2017

Download PDF Attempt Online

Statement A is incorrect.

Enzymes are biological catalysts, and the vast majority of enzymes are proteins. However, not all proteins function as enzymes. Proteins perform a wide variety of functions in living organisms, including structural support (e.g., collagen, keratin), transport (e.g., haemoglobin), defence (antibodies), movement (actin, myosin), and signaling (hormones like insulin). Only a subset of proteins possesses enzymatic activity. There are also some non-protein enzymes, such as ribozymes (RNA molecules).

Statement B is correct: Mostly enzymes are proteins. Statement C is correct: Fats are a major source of stored energy and are thus energy-rich compounds. Statement D is correct: Glucose is a simple sugar (monosaccharide) and is a very common and fundamental carbohydrate, serving as the primary energy source for many organisms.

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