Acid rain caused by human activities, primarily the burning of fossil fuels, contributes to which cycle?
a. nitrogen cycle
b. phosphorus cycle
c. sulfur cycle
d. carbon cycle
c. sulfur cycle
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In an experiment the subjects or items being investigated are divided into the experimental group and
(a) the nonexperimental group. (b) the control group. (c) the statistics group. (d) none of these choices.
In which of the stages below does the chromosome consist of two chromatids?
a. prophase and anaphase b. metaphase, prophase, and anaphase c. metaphase and prophase d. metaphase, telophase, and prophase e. metaphase, telophase, prophase, and anaphase
A neuronal axon transmits neural impulses toward its cell body
____________________ Indicate whether the statement is true or false.
Whether a microtubule shrinks or grows is determined by
a. the rate of GTP-bound tubulin addition relative to the rate of tubulin GTP hydrolysis. b. the phosphorylation state of ?-tubulin. c. the rate of ATP hydrolysis relative to the rate of ATP-bound tubulin addition. d. the presence or absence of ?-tubulin.