Question

what is primary structure of protein, secondary, tertiary and Quaternary proteins plz give me a brief information about this I need

Answer 1

. Primary structure of protein
A protein can be made up of one or more polypeptide molecules. The end of the peptide or protein sequence with a free carboxyl group is called the carboxy-terminus or C-terminus. The terms amino-terminus or N-terminus describe the end of the sequence
with a free α-amino group.
Secondary structure
Stretches or strands of proteins or peptides have distinct characteristic local structural conformations or secondary structure, dependent on hydrogen bonding. The two main types of secondary structure are the α-helix and the ß-sheet.
Tertiary structure
The overall three-dimensional shape of an entire protein molecule is the tertiary structure. The protein molecule will bend and twist in such a way as to achieve maximum stability or lowest energy state. Although the three-dimensional shape of a protein may seem irregular and random, it is fashioned by many stabilizing forces due to bonding interactions between the side-chain groups of the amino acids.
Quaternary structure
The quaternary structure refers to how these protein subunits interact with each other and arrange themselves to form a larger aggregate protein complex. The final shape of the protein complex is once again stabilized by various interactions, including hydrogen-bonding, disulfide-bridges and salt bridges. 

Answer 2

Hi 

Primary structure -  is linear chain of polypeptides 

Secondary - The two most common secondary structure elements are alpha helices and beta sheets

tertiary - To make the protein look like a protein, the secondary structure elements come together to form the tertiary structure

Quaternary - Folded proteins then bind together to form dimer, trimers, or higher order structures