Globular protein of ~ 6kDaconsisting of 51 amino acids arranged in two polypeptide chains held by disulphide bridge is

Insulin

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Fibrinogen

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Glucagon

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Keratin

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Solution

The correct option is C Insulin
Insulin is a small globular protein consist of 51 amino acids and has a mass of 5.81 kDa (~6 kDa). It is composed of two peptide chains referred to as the A chain and B chain. A and B chains are linked together by two disulfide bonds, and an additional disulfide is formed within the A chain.
So the correct answer is option A.

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Similar questions

Q. __________ is a globular protein of

\sim 6 k D a

consisting of

51

amino acids, arranged in

2

polypeptide chains held together by disulphide bridge.

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

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.

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.

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

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