Which of the following hormones are not matched with the proper function?
A. gibberellic acid: mobilizes seed resources
for the developing embryo
B. auxin: stimulates stem elongation
C. cytokinins: stimulates cell division
D. ethylene: inhibits fruit ripening
E. abscisic acid: maintains seed dormancy
D
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The acetylcholine receptor is
A. a ligand-gated ion channel that produces depolarization by allowing Na+ ions to enter the muscle fiber. B. a ligand-gated ion channel that produces hyperpolarization by allowing Na+ ions to enter the muscle fiber. C. a ligand-gated ion channel that produces depolarization by allowing Cl- ions to enter the muscle fiber. D. a ligand-gated ion channel that produces depolarization by allowing K+ ions to leave the muscle fiber. E. a metabotropic receptor that stimulates muscle activity by activating second messenger systems within the muscle fiber.
Humans belong to the phylum ________.
A. chordates B. echinoderms C. arthropods D. mollusks
Explain the importance of decomposition in an ecosystem. Cite an application of this process for human systems
What will be an ideal response?
Which ovarian hormone is at its highest concentration after ovulation?
a. GnRH b. estrogen c. progesterone d. FSH e. LH