How do agricultural practices affect the nitrogen cycle?
What will be an ideal response?
Agriculture depletes soil nitrogen by removing plants from the field. Therefore, the plant parts are not
available for ammonification. Traditional agricultural practices minimized soil erosion and maximized
nutrient retention. For example, farmers rotated their crops, cultivating nitrogen-fixing legumes.
Modern industrial agriculture adds nitrogen to the soil in the form of synthetic fertilizer. Fertilizer
application is related to increased nitrogen in aquatic systems, which affects nitrogen cycling in fresh
and marine systems.
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Regulatory transcription factors: (Select all correct choices)
A. bind to DNA sequences in or near enhancer genes. B. recruit components of the transcriptional complex of proteins. C. recruit the components of the RNA polymerase complex.
During DNA replication, DNA ligase is most active on the lagging strand. Why?
a. The lagging strands contain more short DNA segments than the leading strand, and these short segments are joined together by DNA ligase. b. The lagging strand is synthesized more slowly, and DNA ligase speeds up the DNA polymerase. c. The lagging strand synthesizes DNA in the 3' ? 5' direction. d. The lagging strand requires DNA ligase to couple the RNA primer to the Okazaki fragments. e. The lagging strand has no RNA primase activity; it is replaced by DNA ligase.
Which protozoan group consists solely of parasitic forms?
A) apicomplexans B) ciliates C) flagellates D) amoebas
Assume that in the F2 of a series of crosses, 1/64 of the offspring resemble one of the parents (P). How many gene pairs are involved in producing these results?
A) 3 B) 16 C) 6 D) 32 E) 64