Which scenario illustrates a homeostatic mechanism?
a. city buses transporting people from their houses to their jobs
b. water stored behind a dam that is released to make electricity
c. a thermostat keeping a house at 72 degrees
d. a series of underground passageways connected to a large building
e. the daily temperature variations during one season
c
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A fungal mycelium is a large accumulation of ________, which may appear dusty or fuzzy due to the presence of ________
A) coenocytes / conidia B) coenocytes / mycorrhizae C) hyphae / conidia D) hyphae / mycorrhizae
A technique used in dating a rock can be used to accurately predict the age of the fossils occurring in the rocks. This technique involves
A. fossil dating. B. successive rock layering. C. radioactive isotope decay. D. structural geology. E. developmental geology.
Fungi are decomposers and obtain their food by _________ the organic molecules released by the action of secreted enzymes.
Fill in the blank(s) with the appropriate word(s).
The acetylcholine receptor is a ligand-gated channel that produces
A. Hyperpolarization by allowing Na+ ions to exit the muscle fiber. B. Depolarization by allowing K+ ions to leave the muscle fiber. C. Depolarization by allowing Cl- ions to enter the muscle fiber. D. Repolarization by activating second messenger systems within the muscle fiber. E. Depolarization by allowing Na+ ions to enter the muscle fiber.