Question

Which part of the protein molecule is responsible for function and activity of the proteins
A. Secondary structure
B. Peptide Bond
C. Primary structure
D. Binding sites

Answer 1

Hint: Proteins are a important class of compounds in our body which is used for various functions in our body. It performs various functions. It is basically a constituent unit of amino acids which are basically a class of compound which consists of both amino and carboxyl groups in it. These amino acids forms bonds to make a unit of protein which is made by a type of linkage called as peptide linkage.

Complete Step by Step Answer:
Proteins are large, complex molecules that play many critical roles in our body. They are present in almost all living organisms for the complex reactions taking place inside the body it is of a great role. They consist of amino acid residues joined by peptide bonds.

In organic chemistry peptide bond is an amide type of covalent chemical bond linking present in between two consecutive $\alpha -$ amino acids from ${{C}^{1}}$ carbon atom of one $\alpha -$ amino acid and ${{N}_{2}}$ of another, along a peptide or protein chain.

During translation , peptide bonds are formed from the amino ($N{{H}_{2}}$) to the carboxyl ($-COOH-$) terminus by removal of water (also referred as dehydration or condensation) and catalysed by RNA that forms a part of ribosome. Adding many amino acids produces oligopeptides and finally polypeptides .

Each peptide has an amino terminus , conventionally written on the left side , and a carboxyl terminus, written on the right side. The peptide bond is not ionizable, but it can form hydrogen bonds. Therefore, peptides and proteins tend to be water soluble.
Thus, the correct option will be B.

Note: All the proteins are formed from amino acids only , but all the amino acids cannot form protein as many polypeptides combine to form a single unit of protein. There are many amino acids which are not required by our body from outside those are present in our body only these amino acids are called as non-essential amino acids while those which are required to be taken from outside are called as essential amino acids.