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Biotin: Functions and Properties

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Questions and Answers

Which biochemical role does biotin fulfill in carboxylation reactions?

It acts as an allosteric inhibitor.

It acts as a reducing agent.

It catalyzes the hydrolysis of peptide bonds.

It serves as a carrier of activated carbon dioxide. (correct)

How is biotin typically bound to biotin-dependent enzymes?

Through ionic interactions.

Covalently to the ε-amino groups of lysine residues. (correct)

Via hydrogen bonds.

Through disulfide bridges.

Why does biotin deficiency not occur naturally in humans?

It is widely distributed in food and supplied by intestinal bacteria. (correct)

Biotin is absorbed through the skin from the environment.

Biotin is stored in large quantities in human adipose tissue.

Because biotin is synthesized internally by human cells.

Which vitamin's, specified in the content, requirement in humans is partially fulfilled by intestinal bacteria?

<p>Biotin (Vitamin B7)</p> Signup and view all the answers

In the context of biotin, what specific role does lysine play in biotin-dependent enzymes?

<p>It binds covalently to biotin.</p> Signup and view all the answers

Study Notes

Biotin (B7)

Biotin acts as a coenzyme in carboxylation reactions, serving as a carrier of activated carbon dioxide.
Biotin is covalently bound to the ε-amino groups of lysine residues in biotin-dependent enzymes.
Biotin deficiency is rare in natural occurrences due to its widespread distribution in food.
Intestinal bacteria supply a significant percentage of the biotin requirement in humans.

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Description

Biotin is a coenzyme involved in carboxylation reactions and has a widespread distribution in food. Learn about its functions and properties in the human body.