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Anonymous
ANSWERS: 3
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All proteins consists of 20 specific amino acids. These are :- 01) Valine 02) Leucine 03) Isoleucine 04) Methionine 05) Phenylalanine 06) Asparagine 07) Glutamic acid 08) Glutamine 09) Histidine 10) Lysine 11) Arginine 12) Aspartic acid 13) Glycine 14) Alanine 15) Serine 16) Threonine 17) Tyrosine 18) Tryptophan 19) Cysteine 20) Proline
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Additionally, there is a 21st amino acid now known to be part of some proteins, mainly enzymes, although it is not part of most proteins. This is selenocysteine, and is almost identical to cysteine, except that it has an atom of selenium taking the place of a sulfur: HSe-CH2-CH(NH2)-COOH instead of HS-CH2-CH(NH2)-COOH
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all of them
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