Bacterial decomposition of organic nitrogen results in the production of:
a. ammonia.
b. nitrates.
c. nitrites.
d. atmospheric nitrogen.
e. urea.
d
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Peaks of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) production occur during _____
A) the menstrual flow phase of the uterine cycle B) the beginning of the follicular phase of the ovarian cycle C) the period just before ovulation D) the end of the luteal phase of the ovarian cycle E) the secretory phase of the menstrual cycle
The evolution of a number of ecologically diverse species from a common ancestral species is
a. parapatric speciation. b. sympatric speciation. c. adaptive radiation. d. phyletic gradualism. e. convergent evolution.
Select the choices that are characteristics of hormones.
A. travel in the bloodstream B. affect metabolism of cells with receptors to them C. are secreted by exocrine glands D. can act at a distance between body parts
Leaves:a
represent a fairly small fraction of the overall metabolic budget for a plant. b. depend on the roots to supply CO2. c. are the main photosynthetic organ of most plants. d. are the main site of water uptake in plants. e. prevent CO2 and O2 from entering the plant.