NUTRITION
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: -Some of the proteins are composed of two or more polypeptide chains referred to as sub-units. The spatial arrangement of these subunits with respect to each other is known as quaternary structure.
Detailed explanation-2: -Quaternary structure in proteins is the most intricate degree of organization still considered a single molecule. To be considered to have quaternary structure, a protein must have two or more peptide chains forming subunits. The subunits can be different or identical, and in most cases they are arranged symmetrically.
Detailed explanation-3: -Quaternary Structure Bonds A protein with a quaternary structure is composed of several complex subunits. These subunits are bonded together through non-covalent bonds, primarily via hydrogen bonds and Van der Waals forces, the same weak interactions that promote tertiary structure in proteins as well.
Detailed explanation-4: -Quaternary structure However, some proteins are made up of multiple polypeptide chains, also known as subunits. When these subunits come together, they give the protein its quaternary structure.