Question

Secondary structure of protein refers to?
(A) Sequence of amino acids in polypeptide chain
(B) Bonds between alternate polypeptide chains
(C) Folding patterns of polypeptide chain
(D) Bonding between $N{H_3}^ +$ and $CO{O^ - }$ of two peptides

Answer 1

To solve this question, we must first understand some basic concepts about protein and its structures. Then we need to assess the secondary structure of protein and then only we can conclude the correct answer.

Complete answer: Before we move forward with the solution of this given question, let us first understand some basic concepts:
Step 1: Proteins: are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, responding to stimuli, providing structure to cells and organisms, and transporting molecules from one location to another.
Step 2: Protein secondary structure is the three dimensional form of local segments of proteins. The two most common secondary structural elements are alpha helices and beta sheets, though beta turns and omega loops occur as well. Secondary structure elements typically spontaneously form as an intermediate before the protein folds into its three dimensional tertiary structure.From step 2, we can conclude that the Secondary structure of protein refers to Folding patterns of polypeptide chains.

So, clearly we can conclude that the correct answer is Option (C).

Note: Secondary structure is formally defined by the pattern of hydrogen bonds between the amino hydrogen and carboxyl oxygen atoms in the peptide backbone. Secondary structure may alternatively be defined based on the regular pattern of backbone dihedral angles in a particular region of the Ramachandran plot regardless of whether it has the correct hydrogen bonds.