Kisspeptin is a protein (coded for by the KISS-1 gene) that in humans has an important role in initiating secretion of gonadotropin-releasing hormone (GnRH),

a hormone that stimulates
the anterior pituitary gland to release other hormones related to reproduction.
Endocrinologists are finding that the protein kisspeptin and its receptor are central to sexual
maturation at puberty. The receptor for kisspeptin is coded for by the gene GPR54. Given the
information above, the product of GPR54 is:
A. a steroid.
B. an intracellular protein.
C. an extracellular protein.
D. an amine.
E. a transmembrane protein.


E

Biology & Microbiology

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____.

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To confirm a presumptive identification of an isolate of streptococci, serological testing is performed.

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