Question

what group of proteins are opioid receptors characterized as?
peripheral
recognition
enzymatic
transmembrane
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Explanation:

Opioid receptors are integral membrane proteins that span the cell membrane. Transmembrane proteins are a type of protein that has one or more segments that span the membrane. Peripheral proteins are loosely associated with the membrane. Recognition proteins are for cell - cell recognition. Enzymatic proteins catalyze reactions. Since opioid receptors are embedded in the cell membrane, they are transmembrane proteins.

Answer:

Transmembrane