Behavior that increases the reproductive success of the individual performing it is most specifically termed ________
a. adaptive
b. acoustical
c. sexual
d. instinctive
a
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The movement of phloem sap is best described from the ____ to the ____
a. shoot system; root system b. sinks; sources c. root system; shoot system d. sources; sinks e. shoot system; sinks
What is the product of HIV reverse
transcriptase?
a. single stranded DNA b. double stranded DNA c. single stranded RNA d. double stranded RNA e. more than one of these
Which statement about the phosphorus cycle is false?
A) The main abiotic reservoir for phosphorus is in the water. B) Plants release dissolved phosphate ions into the soil. C) Phosphates that drain from soils into the sea become part of new rock and will cycle back into living organisms. D) Guano can be used by farmers to add phosphorus to the soil.
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 hCG maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. B. 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. C. 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. D. The embryo's secretion of GnRH maintains the corpus luteum, keeping FSH and LH high until the placenta takes over secretion of these hormones.