How many essential amino acids are there?
Correct answer: C. Nine
- A. Three
- B. Six
- C. Nine
- D. Twelve
Explanation
There are nine essential amino acids. They are essential because they cannot be made by the body. They must be taken from food. Their names are Histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.
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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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