Which of the following best describes the special "high-energy" bond of ATP?
A) phosphoester
B) phosphoanhydride
C) hydrogen
D) ionic
E) hydrogenation
B) phosphoanhydride
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The mycorrhizae found interacting with the roots of land plants are
a. pathogens, feeding on plant tissue they have damaged with toxins. b. parasites, draining sugar from the plant's vascular system. c. saprophytes, stripping dead tissue from the root. d. symbionts, facilitating the plant's uptake of minerals. e. commensals, exploiting a benign environment, but neither helping nor harming the plant.
What statement best describes “biology”?
a. The science of life b. The naming of organisms c. The study of natural selection
d. The measurement of populations e. The study of how organisms are related to one another
A biome characterized by hot days, cold nights, and cacti is the
A. tropical rain forest. B. tundra. C. desert. D. taiga.
In order to successfully and safely deliver a gene to a human cell, a virus vector must be
A) both infectious and pathogenic. B) packaged with RNA rather than DNA. C) pathogenic but not infectious. D) infectious but not pathogenic. E) a retrovirus.