Nitrification is the process of ____
a. converting nitrogen gas to ammonia
b. converting nitrogen gas to nitrate
c. converting ammonium to nitrate
d. converting nitrate to ammonia
e. converting nitrate to nitrogen gas
ANSWER: c
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A seed from a yew tree germinates on the forest floor. During the first few months of its life, the sapling dedicates most of its resources to increasing in height rather than producing the defensive compound taxol
What is this allocation of resources an example of? A. a symbiosis B. a trade-off C. a constitutive defense D. an inducible defense E. a basal response
During bacterial conjugation, interrupted matings yielded the following information: leu 10 minutes, arg 8 minutes, str 15 minutes, and amp 12 minutes. Based on this information, the order of the genes, beginning at the origin, is
A) amp-arg-leu-str. B) str-amp-leu-arg. C) leu-arg-str-amp. D) arg-amp-leu-str. E) arg-leu-amp-str.
In female mammals,
A) the maternally inherited X chromosome is shut off in every cell. B) the paternally inherited X chromosome is shut off in some cells. C) one X chromosome is shut off in a germline cell. D) both SRY genes are activated.
During _________, the chromosomes have reached the poles and a new nucleus forms around them.
a) anaphase b) metaphase c) telophase d) prometaphase e) prophase