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What bonds stabilize the extracellular structure of proteins?

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What bonds stabilize the extracellular structure of proteins?

(a) Hydrogen bond

(b) Disulfide bonds

(c) Hydrogen bonds

(d) Ionic bonds

This question was addressed to me in an international level competition.

I need to ask this question from Biopharmaceuticals in chapter Biopharmaceuticals of Drug Biotechnology

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Right answer is (b) Disulfide bonds

To explain I would say: Bonds that stabilize tertiary structure are: hydrogen, disulfide, ionic and hydrophobic bonds. Intracellular protein tertiary structures mostly held together by weak forces.  Extracellular tertiary structures stabilized by disulfide (covalent) bonds.

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