Which of the following is NOT a function of proteins in the body?
Correct answer: D. Serving as the main long term energy store
- A. Acting as enzymes
- B. Transporting oxygen
- C. Providing antibodies for defence
- D. Serving as the main long term energy store
Explanation
The body stores energy as fat and, in the short term, as glycogen, and proteins are broken down for energy only when those stores are exhausted, since doing so sacrifices functional tissue. Enzymes, haemoglobin and antibodies are all proteins, as are hormones such as insulin and structural materials such as collagen. This breadth of function is why protein is an essential part of the diet.
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About Importance of Proteins
Proteins are polymers of amino acids joined by peptide bonds, and their biological roles depend on primary, secondary, tertiary and quaternary structure. Coverage includes enzymes, hormones, antibodies, transport proteins, muscle fibres and structural tissues, together with denaturation and the effects of heat, pH and chemicals.
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