Essential amino acids are those that
- 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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