Which of the following is an incorrect statement: a) All natural protein amino a

Question

Which of the following is an incorrect statement: a) All natural protein amino acids are D-amino acids. b)-amino acids found in proteins can be classified according to whether the R-group is hydrophobic or hydrophilic. c) The differences in the chemical and physical properties of the 20 amino acids resides in the nature of the "R" groups.  

d) It is the chemistry of the "R" groups that determine the many interactions that stabilize the structure of the protein and enable it's biological function.  

e)Each of the 20 -amino acids found in proteins can be distinguished by the R-group substitution on the -carbon atom.

Explanation / Answer

a) a All natural protein amino acids are D-amino acids this is a in corect answer

Every amino acid (except glycine) can occur in two isomeric forms, because of the possibility of forming two different enantiomers (stereoisomers) around the central carbon atom. By convention, these are called L- and D- forms, analogous to left-handed and right-handed configurations.

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