How does the availability of milkweed plants affect the migration of monarch butterflies?
a. Without milkweed plants, the female monarch would starve.
b. Without milkweed plants, the monarch larvae would starve.
c. Without milkweed plants, the male monarch would starve.
d. When milkweed plants are abundant, monarch predators would thrive
e. When milkweed plants are abundant, the male monarch could not find a mate.
b
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According to Fig. 9.6, what is a key difference between cell signaling mediated by a surface receptor, compared to that mediated by an intracellular receptor?
A. Cell-surface receptors bind to specific signaling molecules; intracellular receptors bind any signaling molecule. B. Cell-surface receptors typically bind to smaller signaling molecules than those bound by intracellular receptors. C. Cell-surface receptors bind polar signaling molecules; intracellular receptors bind nonpolar signaling molecules. D. Signaling molecules that bind to cellsurface receptors lead to cellular responses restricted to the cytoplasm; signaling molecules that bind to intracellular receptors lead to cellular responses restricted to the nucleus. E. None of these statements about cell signaling differences is correct.
In plants, the sporophyte generation produces _______ as a result of meiosis.
Fill in the blank(s) with the appropriate word(s).
In soft-bottom communities deposit feeders dominate
a. where sediments are generally muddy. b. as epifauna on worm tubes. c. as meiofauna. d. where sediments are generally sandy. e. where oxygen levels are low.
What body signal, interpreted by the brain stem, will cause the diaphragm to contract?
A) levels of oxygen in the blood B) levels of carbon dioxide in the blood C) levels of carbon monoxide in the blood D) levels of hemoglobin in the blood