Question
Which of the following statement is true about different structures of protein-
A. Secondary structure is the three-dimensional structure of protein
B. Secondary structure is stabilized by disulfide bonds
C. Primary, secondary and tertiary structures destroyed during denaturation
D. The secondary and tertiary structure depends on the sequence of amino acids
Show Answer
|
Correct Answer » D
Explanation
|
|
Proteins are arranged in any of the following four structures viz:
* Primary – The sequence of amino acids in a protein is called the primary structure of the protein.chain
*Secondary – The polypeptide backbone does not assume a random three-dimensional structure, but instead generally forms regular arrangements of amino acids that are located near to each other in the linear sequence. The α-helix, β-sheet, and β-bend (β-turn) are examples of secondary structures frequently encountered in proteins.
* Tertiary – It refers to the three-dimensional arrangement of a polypeptide chain that has assumed its secondary structure. Disulfide bonds between cysteine residues may stabilize the tertiary structure. Protein denaturation results in the unfolding and disorganization of the protein’s secondary and tertiary structures, which are not accompanied by hydrolysis of peptide bonds
* Quaternary – The quaternary structure requires more than one polypeptide chain. These chains associate through noncovalent interactions.
