__________ is a globular protein of 6 kDa consisting of 51 amino acids arranged in 2 polypeptide chains held together by a disulphide bridge.

Glucagon

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Keratin

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Fibrinogen

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Insulin

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Solution

The correct option is D
Insulin

Insulin is a globular protein. It has two polypeptide chains which are coiled about themselves to form spherical molecules.

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Q. Assertion :Insulin is a globular protein. Reason: It has two polypeptide chains with 21 and 30 amino acids joined by sulphur bridges connecting cysteine amino acid on the two chains.

In fibrous proteins, polypeptide chains are held together by ........... .
(a) van der Waals forces (b) disulphide linkage
(c) electrostatic forces of attraction (d) hydrogen bonds

Q. Which of the following statements regarding the structure of proinsulin and mature insulin are not correct?
(i) Proinsulin is made up of three polypeptide chains A, B, and C.
(ii) C-polypeptide chain with 33 amino acids is removed prior to insulin formation.
(iii) Mature insulin is made up of 51 amino acids and arranged in two polypeptide chains-A and B.
(iv) Polypeptide chain A has 30 amino acids and polypeptide chain B has 21 amino acids.
(v) Polypeptide chains A and B are interconnected by only one S-S linkage.

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__________ is a globular protein of 6 kDa consisting of 51 amino acids arranged in 2 polypeptide chains held together by a disulphide bridge.

The correct option is D Insulin Insulin is a globular protein. It has two polypeptide chains which are coiled about themselves to form spherical molecules.

The correct option is D
Insulin

Insulin is a globular protein. It has two polypeptide chains which are coiled about themselves to form spherical molecules.