Question

3. Both optical forms of amino acids exist in cells, only the L-isomer occurs in biological proteins.
Why do you think that only L-isomers of amino acids might have been selected for use in
proteins of living cells today?​

Answer 1

Answer:

All amino acids are absorbed as l-form except methionine amino acid is absorption as d-form because their absorption is coupling with sodium content, but other amino acid are independent on Na content.

Mark me as brilliant ☺️