The process of adding hydrogen to N2, creating NH3 and eventually NH4+, and which requires a substantial input of ATP, is called ____.
a. nitrification
b. ammonification
c. nitrogen cycling
d. nitrogen fixation
e. nitrogen assimilation
ANSWER: d
You might also like to view...
A monomer is to a polymer, as glucose is to
A. lipids. B. carboyhydrates. C. nucleic acids. D. proteins. E. None of the choices are correct.
True or false? Animal cells do not have cell walls
Indicate whether the statement is true or false
A microbiologist is working with a bacteria strain to determine if cells are competent. Cells are grown under optimal conditions with DNA fragments that carry two genes, green fluorescent protein and ampicillin resistance, and then plated to nutrient agar with and without ampicillin. Following incubation, plates are examined for fluorescent colonies under a UV lamp. Predict the results if cells are competent.
A. Fluorescent colonies will be present on both types of plates. B. Fluorescent colonies will be present on the ampicillin agar plates, but there will be no growth on the nutrient agar plates. C. There will be no growth on either type of plate. D. Colonies will be present on both types of plates, but will only fluoresce on the ampicillin agar plates.
After the drought of 1977, researchers on the island of Daphne Major hypothesized that medium ground finches that had large, deep beaks, survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoides fruits. If this hypothesis is correct, what would you expect to observe if a population of these medium ground finches colonizes a nearby island where Tribulus cistoides is the most abundant food for the next 1000 years? Assume that (1 ) even the survivors of the 1977 drought sometimes had difficulty cracking the tough T. cistoides fruits and would eat other seeds when offered a choice; and (2 ) food availability is the primary limit on finch fitness on this new island.
A) evolution of yet larger, deeper beaks over time B) evolution of smaller, pointier beaks over time C) random fluctuations in beak size and shape D) no change in beak size and shape