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
Answer:
A. travel in the bloodstream
B. affect metabolism of cells with receptors to them
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When a transposable element inserts into a gene, it can (select all correct choices):
A. interfere with transcription. B. cause errors in RNA processing. C. disrupt the open reading frame. D. cause the gene to duplicate itself. E. cause the gene to delete itself.
In flowering plants, pollen grains form in the
flower's male parts called
a. stamens. b. anthers. c. carpels. d. megaspores. e. endosperms
Totipotent human stem cells can apparently be obtained only from:a
bone marrow. b. umbilical cords. c. cancer patients. d. zygotes. e. gametes
Red light has a longer wavelength than blue light. Will red light have a higher or lower energy content than blue light?
a) higher b) lower