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What is Ubiquitin?

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What is Ubiquitin?

(a) Protein kinase

(b) Protease

(c) Component of the electron transport system

(d) Protein that tags another protein for proteolysis

I had been asked this question during an internship interview.

The doubt is from Regulation of the Cell Cycle by Protein Kinases topic in division Biosignalling of Biochemistry

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Right option is (d) Protein that tags another protein for proteolysis

To explain: Ubiquitin binds to a substrate protein resulting in their degradation.

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