Essential amino acids are those that
Correct answer: B. cannot be synthesised by the body and must be supplied in the diet
- A. are found in every protein
- B. cannot be synthesised by the body and must be supplied in the diet
- C. are needed only during childhood
- D. make up the active site of every enzyme
Explanation
About nine of the twenty amino acids cannot be made by the human body at a useful rate, so they have to come from food, and a protein supplying all of them in good proportion is called a complete protein. Animal proteins are generally complete while most single plant proteins are not, which is why combinations such as rice with pulses matter in a vegetarian diet. All twenty are essential to the cell in the ordinary sense; the term refers only to dietary need.
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About Proteins
Proteins are polymers of amino acids joined by peptide bonds, and their function depends on primary, secondary, tertiary and quaternary structure. The topic covers fibrous and globular proteins, enzymes, antibodies, hormones and transport proteins, as well as denaturation by heat or extreme pH.
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