Menstrual flow begins in response to:
a. rising levels of FSH and LH
b. falling levels of estrogen only
c. falling levels of progesterone only
d. falling levels of estrogen and progesterone
e. rising levels of LH and falling levels of FSH
d
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Which one of the following properties of water is primarily responsible for the ability of trees to draw water up from the roots to the leaves?
A. polarity B. density C. solvent capability D. high surface tension E. pH neutrality
Rice plants may be tolerant or intolerant to flooding. A true-breeding tolerant plant was crossed with a true-breeding
intolerant plant, and approximately 75% of the F1 generation was tolerant to flooding. What does this most likely suggest about the flood-tolerant and flood-intolerant alleles?
a. Multiple alleles control flood-tolerance. b. The alleles for flood-tolerance and flood-intolerance are codominant. c. The allele for flood-tolerance is incompletely dominant. d. The allele for flood-intolerance is dominant, while the allele for flood-tolerance is recessive. e. The allele for flood-tolerance is dominant, while the allele for flood-intolerance is recessive.
cA toxic substance (compound x) had been found to inhibit glucose transport into mammalian cells. If
this substance was administered to a hamster, the likely cause of death would be from a lack of ____.
a. NAD+ production b. ATP production c. GTP production d. CO2 production e. FAD production
The reproductive structures of some cycad species produce nectar, and insects play a role in the pollination of these species.
Answer the following statement true (T) or false (F)