The Existence of a Nociceptin (NOP)receptor Has Been Questioned Because $\beta$

question 67

Multiple Choice

The existence of a nociceptin (NOP) receptor has been questioned because it does not respond to:

• A)\(\beta\)-endorphin.
• B)dynorphin-A.
• C)dynorphin-B.
• D)naloxone.

---

Definitions:

Concentration Gradient

The gradual difference in the concentration of solutes in a solution between two regions, often leading to diffusion.

Electron Transport Chain

A series of protein complexes and other molecules that transfer electrons from electron donors to electron acceptors via redox reactions and generate ATP in the process.

Decarboxylation

A reaction in which a molecule of CO2 is removed from a carboxyl group of an organic acid.

Carboxyl Group

A functional group consisting of a carbon atom double-bonded to an oxygen atom and single-bonded to a hydroxyl group (-COOH), present in organic acids.