The symbiotic bacteria found in the root nodules of legumes do all of the following EXCEPT:a
supply the plant with the nitrogen it needs in the form of nitrates.
b. are motile bacteria.
c. are Rhizobial bacteria.
d. are soil-dwelling bacteria.
e. digest wood.
E
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Which evolutionary innovation was most significant in helping tetrapods move to dry terrestrial environments?
A) the lung B) the amniotic egg C) bone D) limb specialization E) endothermy
All of the following are abiotic factors within an ecosystem except ________.
A. fire B. nutrients C. energy D. All of the above are abiotic factors.
Sexual reproduction in algae utilizes meiosis that results in the production of
A. spores with twice as much DNA as the parental cells. B. gametes with half the amount of DNA as in the parental cells. C. spores with the same amount of DNA as the parental cells. D. swarming cells with the same amount of DNA as the parental cells.
The UV light affects the nucleotide bases of DNA. What can UV light form, and how many neighbouring bases of DNA become covalently linked in this situation?
a. It can form a primer with two bases linked. b. It can form a dimer with one base linked. c. It can form a trimer with three bases linked. d. It can form a dimer with two bases linked.