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
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If you see a male calico cat, you can be fairly certain that his diploid cells have a sex chromosome combination of
____.
a. XYY b. XY c. XX d. XXY e. XO
Substitution of one base pair for another in a coding region of a gene can result in a ____ mutation where the changed
codon specifies a different amino acid.
a. missense b. chromosomal c. frameshift d. silent e. nonsense
Preliminary digestion of carbohydrates begins in the _____.
A. mouth B. esophagus C. stomach D. duodenum E. jejunum
To confirm a presumptive identification of an isolate of streptococci, serological testing is performed.
A) True B) False