Question

1. which functionaal groups are present on the backbone of every amino acid?

2. is polypeptide is a protein?

3. at the secondary level of protein structure what types of bonds occur between components of the polypeptide backbone ?

Answer 1

Ans.1.

All amino acids have the same backbone structure, with an amino group ,a carboxyl group, an α-hydrogen, and a variety of functional groups (R) all attached to the α -carbon.

Ans.2.

no, polypeptide is not a protein but Protein is a polypeptide.

Polypeptide refers to a polymer linked by peptide bonds.So a polypeptide has amino acids as the monomer unit. All proteins are polypeptides. But all polypeptides are not because A polypeptide is a single linear chain of many amino acids (any length), held together by amide bonds.

A protein consists of one or more polypeptides (more than about 50 amino acids long). An oligopeptide consists of only a few amino acids (between two and twenty).

Ans 3

Secondary structure is formally defined by the pattern of hydrogen bonds between the amino hydrogen and carboxyl oxygen atoms in the peptide backbone.