Describe how testosterone concentrations are regulated by negative feedback mechanisms. What will be an ideal response?
Concepts to Consider: GnRH is released from the hypothalamus and stimulates the pituitary
to secrete FSH and LH. These, in turn, stimulate testosterone secretion. The presence of
testosterone then inhibits secretion of GnRH from the hypothalamus. It also affects the
pituitary gland by blocking the actions of GnRH on FSH and LH synthesis and release.
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The cells created during binary fission are which of the following?
a. genetically unique b. larger than the parent cell c. genetically identical d. a genetic mix of the two parent cells
When the proteins pull the sister chromatids to the center it is called what?
What will be an ideal response?
You've stumbled upon a thick mat of moss in the woods. Upon closer inspection, you observe sporophytes emerging from the gametophytes. From your previous biology course, you know that the sporophyte is attached to a(n)
A) archegonium. B) antheridium. C) embryo sac. D) female cone. E) flower.
The side toes of a horse, the pelvis of the whale, and the human appendix are all examples of structures that resemble structures of presumed ancestors, which are known as
A. analogous structures. B. homologous structures. C. acquired structures. D. vestigial structures. E. homeotic mutations.