BIOLOGY
CARBOHYDRATES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The sequence of amino acids in the chain
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The initial twisting of the chain into
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The 3D folding of the chain into a specific shape
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The joining of two or more polypeptide chains
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Detailed explanation-1: -Secondary structure refers to regular, local structure of the protein backbone, stabilised by intramolecular and sometimes intermolecular hydrogen bonding of amide groups.
Detailed explanation-2: -An -helix secondary structure is stabilized by hydrogen bonds between carbonyl oxygen and the amino group of every third residue in the helical turn with each helical turn consisting of 3.6 amino acid residues (Fig. 10.1A). The side chain of amino acids is projected outward from the outer helical surface.
Detailed explanation-3: -Secondary structure is generated by formation of hydrogen bonds between atoms in the polypeptide backbone, which folds the chains into either alpha helices or beta-sheets. Tertiary structure is formed by the folding of the secondary structure sheets or helices into one another.
Detailed explanation-4: -Alpha-Helix and Beta-Pleated sheets are types of the secondary structure of the protein. They both are shaped by hydrogen bonding between the carbonyl O of one amino acid and the amino H of another.