which one is incorrect? Which one of the following 5 statements is incorrect? A.
ID: 309468 • Letter: W
Question
which one is incorrect?
Which one of the following 5 statements is incorrect?
A. In a peptide, the bonds between the amino group and the alpha carbon atom and between the alpha carbon atom and the carbonyl group are pure single bonds.
B. When a peptide bond is formed between the alpha-carboxyl group of one amino acid and the alpha-amino group of another amino acid, both the amino and carboxyl groups can still be charged.
C. Alpha helices have a tightly coiled backbone, whereas beta-strands are almost fully extended.
D. Disulfide bonds can form between cysteine residues in the same polypeptide chain or they can link to separate polypeptide chains together.
E. In a pair of peptide-bonded amino acids, six atoms (C-alpha, C, O, N, the amide-N's H, and C-alpha) lie in a plane
Explanation / Answer
In the above statements regarding peptide bonds, the statement B is incorrect,
Because, when a peptide bond is formed between the alpha-carboxyl group of one amino acid and the alpha-amino group of another amino acid, it becomes uncharged but remains polar, i.e. peptide bond neither accept nor give off protons. So, both the amino and carboxyl groups remains neutral.
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