The conformation of Pro-X peptide bonds needs to be compared with that of X-Pro peptide bonds. Concept introduction: Amino acids are compounds containing amino as well as acidic group. The general molecular structure of an amino acid is as follows: NH 2 -CHR-COOH Here, R is different group for different amino acids. If there is more than one amino group present in an amino acid, they are considered as basic amino acids and if there is more than one carboxylic group then they are considered as acidic amino acids. Two or more amino acids combine to form di- or polypeptide chains. Here, peptide bond is the amide bond formed between the two amino acids.

Question

At a pH equal to the isoelectric point (pl) of alanine, the net charge of alanine is zero. Two structures can be drawn that have a net charge of zero, but the predominant form of alanine at its pl is zwitterionic. CH3 H,N CH3 ** H¸N-C H Zwitterionic H Uncharged OH Select statements that explain why alanine is predominantly zwitterionic at its pl. pk of alanine's amino group is more than its pl. pk of alanine's carboxyl group is more than its pl. PK of alanine's carboxyl group is less than its pl. pk of alanine's amino group is less than its pl. Correct Answer What fraction of alanine is in the completely uncharged form at its pl? 1 in 2.2 × 107 1 in 1.6 × 10² 1 in 4680 1 in 9460

Answer 1

Question

Chapter 2, Problem 32P

Interpretation Introduction

Interpretation:

The conformation of Pro-X peptide bonds needs to be compared with that of X-Pro peptide bonds.

Concept introduction:

Amino acids are compounds containing amino as well as acidic group. The general molecular structure of an amino acid is as follows:

NH2-CHR-COOH

Here, R is different group for different amino acids. If there is more than one amino group present in an amino acid, they are considered as basic amino acids and if there is more than one carboxylic group then they are considered as acidic amino acids.

Two or more amino acids combine to form di- or polypeptide chains. Here, peptide bond is the amide bond formed between the two amino acids.

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