Plants cannot enable and improve access to particular nutrients by
a. releasing amino acids into the soil.
b. releasing carbohydrates into the soil.
c. releasing enzymes into the soil.
d. releasing organic substances into the soil.
e. releasing carbon dioxide into the soil.
E
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The following represents a portion of one half of a DNA strand: TCGAAGTC. Which of the following represents a single mutation in this portion of DNA?
a. AGCTTCAG b. TCGTAGTC c. UCGAAGUC d. ACGUUCAC
The notion of orthogenesis is no longer supported because we now know that evolution proceeds as an ongoing
process of dynamic adjustment, not toward any fixed goal.
a. True b. False
Streptomyces are aerobic soil bacteria that produce over two-thirds of our antibiotics. Why might a bacterium produce antibiotics?
A. to kill competing bacteria of the same species B. to protect itself from a host immune system C. to kill viruses that may try to infect it D. to allow it to break down the cell walls of plants E. to kill competing bacteria of different species
An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to _____
A) change the atmosphere from oxidizing to reducing B) make it easier to maintain reduced molecules C) cause iron in ocean water and terrestrial rocks to rust (oxidize) D) prevent the formation of an ozone layer