Compared to plants from other environments, the cells of many desert plants contain high concentrations of solutes
This helps them survive in their arid surroundings because the high solute concentrations create relatively _____, which help reduce water loss.
A) low solute potentials
B) high pressure potentials
C) low pressure potentials
D) high solute potentials
Answer: A
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Which of the following statements about double fertilization in angiosperms is correct?
A) One pollen grain combines with the egg to form the zygote, and one pollen grain combines with the polar nuclei to form endosperm. Two sperm combine with a polar nucleus to form endosperm. B) Two pollen grains combine with two ovules to form the zygote and endosperm. C) One sperm combines with the polar nuclei to form the zygote, and one sperm combines with the egg to form endosperm. D) One sperm combines with the egg to form the zygote, and one sperm combines with the polar nuclei to form endosperm.
Solar radiation:a
powers the hydrologic and other biogeochemical cycles. b. is essential for chemosynthesis. c. is the product of a massive nuclear fission event. d. is eventually released from fossil fuels. e. is eventually released via decomposition.
Protein products of which genes "put the brakes" on the cell cycle when DNA is damaged or incompletely copied?
A. Checkpoint genes B. Breakpoint genes C. Proofreading genes D. DNA repair genes E. DNA reconstruction genes
__________ is rapid diversification into new species that occupy novel niches.
Fill in the blank(s) with the appropriate word(s).