Why Is the Imidazole R-Group of Histidine a Particularly Versatile

question 49

Multiple Choice

Why is the imidazole R-group of histidine a particularly versatile amino acid side chain in terms of its involvement in enzymatic reaction mechanisms?

• A) It is strongly involved in specific acid-base catalysis.
• B) It acts as a strong electrophile.
• C) It disrupts H-bonds and stabilizes exposed peptide residues.
• D) It acts as a strong nucleophile as well as a general acid or base.
• E) It contains a high energy phosphate bond.

---

Definitions:

Financing Activities

Transactions related to raising capital and repaying investors, including issuing equity, obtaining loans, and paying dividends.

Exchange for Land

A transaction in which a piece of land is acquired in exchange for something of value, rather than a direct financial purchase.

Adjusted Trial Balance

A trial balance that reflects all adjustments made in accounting records, used to prepare financial statements.

Financial Position

Describes an entity's financial health, assessed by examining its assets, liabilities, and equity at a specific point in time.