Which of the following is NOT true of GnRH?
a. it is produced in the hypothalamus
b. it causes cells in the anterior pituitary to
release FSH
c. it causes cells in the posterior pituitary to
release LH
d. it functions the same in both males and
females
e. more than one of these is NOT true of
GnRH
C
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Considering the catabolite repression mechanism, which observation would make you suspect it is NOT occurring?
A) CRP bound to promoter sites B) elevated levels of transcripts for maltose and sucrose catabolism C) relatively low intracellular cyclic AMP levels D) RNA polymerase bound to biosynthetic promoter sequences
How is the distinctive fur pattern of a calico cat produced?
a. by X-chromosome inactivation b. by hormones c. by Y-chromosome inactivation d. by epistasis
The barbed (fast growing) end of actin filaments is located in muscle
a. at the AI junction. b. near the M line of a contracted sarcomere c. at the inner margin of the AI zone d. at the Z disc e. none of the above
The number of individuals occupying a unit of habitat (volume or area) is the ___________.
A. distribution B. carrying capacity C. population density D. population size E. birth rate