The 20 different amino acids are characterized by A. whether or not their carbox

Question

The 20 different amino acids are characterized by

A.   whether or not their carboxyl ends are negatively charged

B.   whether or not their amino ends are positively charged

C.   the nature of their R groups

D.   the length of their peptide backbone

E.   how many hydrogen they have

   Secondary structure in proteins depends on the ability of

A.   amino H’s to hydrogen bond

B.   carboxyl O’s to hydrogen bond

C.   H’s bound to the central carbon to hydrogen bond

D.   all of the above

E.   only A & B above

Explanation / Answer

Answer :C

The 20 amino acids are characterised by the nature of their R groups. Each of them has a very specific side chain structure, & so is the role of each is very specific & unique.

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