At one time, the pituitary was known as the ‘master gland’. Explain why this name is both fitting and
misplaced. What will be an ideal response?
It is fitting because pituitary releases hormones impacting many other systems, including the adrenal
glands, gonads, kidneys and more. Thus, the pituitary impacts many body systems. However, it was
later revealed that the hypothalamus was largely in control of homeostasis in general and the pituitary
specifically. Thus, the ‘master gland’ had its own master.
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Which of the following is one of the big differences between eukaryotic and prokaryotic DNA replication?
a. Helicase is not used by eukaryotes. b. There is no topoisomerase found in eukaryotic cells. c. In eukaryotic DNA replication, histones must be removed. d. Only eukaryotes have Okazaki fragments to be ligated.
In the life cycle of bryophytes and seedless vascular plants, meiosis takes place in the
a. gametophyte. b. sporangium. c. archegonium. d. zygote. e. antheridium.
An extremely rare occurrence in humans is a multiple pregnancy with the embryos at different stages due to fertilization weeks apart. What mechanism normally prevents this from happening?
A. The embryo's secretion of FSH and LH maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. B. The embryo's secretion of GnRH maintains the corpus luteum, keeping FSH and LH high until the placenta takes over secretion of these hormones. C. The embryo's secretion of hCG maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. D. The follicle's secretion of polar bodies maintains the fimbriae, keeping estradiol and progesterone high until the fallopian tube takes over secretion of these hormones.
Lamarck believed
a. that a substance called fluida moved through the nerves to areas of the body in need of change. b. in the inheritance of acquired characteristics. c. that giraffes’ necks elongated in response to stretching. d. that environmental pressures bring about changes in organisms. e. all of these were true.