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Secondary Structure of Proteins

Name the stru...

Question

Name the structure of protein in which all peptide chains are stretched out to full extension and laid side by side through intermolecular hydrogen bonds.

A

None of the above

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B

β

-pleated sheet

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C

α

-helix

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D

tertiary structure

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Solution

The correct option is B $β$ -pleated sheet
$β$ -pleated sheet: In this structure, all peptide chains are stretched out to a nearly maximum extension and then laid side by side that are held together by intermolecular H-bond. The polypeptide chains can link together in parallel and antiparallel sequence. Thus option b is correct.

$α$ -helix: In this structure, a polypeptide chain forms all possible H–bonds by twisting into a right-handed screw helix.

Tertiary Structure of Proteins: It represents overall folding of the polypeptide chains i.e., further folding of the secondary structure producing a 3D structure.

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Proteins are found to have two different types of secondary structures viz $α -$ helix and $β -$ pleated sheet structure. $α -$ helix structure of protein is stabilised by
(a) peptide bonds (b) van der Waals, forces
(c) hydrogen bonds (d) dipole-dipole interactions

Q. Regarding secondary structure of a protein, correct statement(s) is/are
A) Peptide bonds possess regional planarity.
B)

C = O

- N H

of different peptide chains are held by Van der Waal's attractions.
C) They have closely packed arrangement so as to minimise repulsion between R groups.

In which structure of protein, the polypeptide chain forms all possible hydrogen bonds by twisting into right handed screw?

β - p l e a t e d

sheet structure of protein shows maximum extension. Reason: Intermolecular hydrogen bonding is present in them.

Q. A peptide is a short chain of amino acids. The amino acids in a peptide are connected to one another in a sequence by bonds called peptide bonds. Typically, peptides are distinguished from proteins by their shorter length, although the cut-off number of amino acids for defining a peptide and protein can be arbitrary.
Peptides are generally considered to be short chains of two or more amino acids. Meanwhile, proteins are long molecules made up of multiple peptide subunits, and are also known as polypeptides. Proteins can be digested by enzymes (other proteins) into short peptide fragments. Among cells, peptides can perform biological functions. For example, some peptides act as hormones, which are molecules that when released from cells affect other areas of the body.
A decapeptide (Mol. Wt. 796 g/mol) on complete hydrolysis gives glycine (Mol. Wt. 75 g/mol), alanine and phenylalanine. Glycine contribute 47% to the total weight of the hydrolyzed product.The number of glycine units in the decapeptide is:

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Secondary Structure of Proteins

Standard XIII Chemistry

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