Which of the following represents
nitrification?
a. conversion of nitrogen gas to ammonia
b. conversion of nitrogen gas to nitrate
c. conversion of ammonia to nitrate
d. conversion of nitrate to ammonia
e. conversion of nitrate to nitrogen gas
C
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Which amino acid results from this codon?
What will be an ideal response?
What type of feedback is exemplified by the formation of a blood clot that results in the rise of blood pressure?
A. negative feedback B. positive feedback C. endocrine feedback D. nervous feedback E. hormonal feedback
Data were collected from the heterocysts of a nitrogen-fixing cyanobacterium inhabiting equatorial ponds. Study the following graph and choose the most likely explanation for the shape of the curve
A) Enough oxygen (O2 ) enters heterocysts during hours of peak photosynthesis to have a somewhat-inhibitory effect on nitrogen fixation. B) Atmospheric nitrogen (N2 ) levels increase at night because plants are no longer metabolizing this gas, so they are not absorbing this gas through their stomata. C) Heterocyst walls become less permeable to nitrogen (N2 ) influx during darkness. D) The amount of fixed nitrogen that is dissolved in the pond water in which the cyanobacteria are growing peaks at the close of the photosynthetic day (1800 hours).
If a trait is polygenic, then:
a. Mendel's laws do not apply. b. it is polygenic. c. its inheritance is multifactorial. d. B and C. e. All of the above.