To date, humans have interfered with all of the biogeochemical cycles on Earth, but this interference has been of the
greatest magnitude, in terms of human-induced changes in climate, in the:a.
hydrologic cycle.
b. nitrogen cycle.
c. carbon cycle.
d. sulfur cycle.
e. phosphorus cycle.
c
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Which of the following is not true of the site-specific recombination reaction catalyzed by tyrosine-class recombinases?
A. One recombinase subunit becomes covalently linked to the DNA through a phosphotyrosine bond. B. The overall reaction proceeds with a minimal free-energy change. C. The overall reaction requires four unique cleavage events. D. Isomerization of the Holliday intermediates includes branch migration through the core sequence. E. All of the choices given are true.
The above figure shows areas of referred pain
that indicate an internal organ is damaged. Which letter corresponds to heart damage? a. A b. B c. C d. D e. none of these
Which structure adjusts to control the intensity of incoming light?
a. cornea b. sclera c. iris d. ciliary body e. fovea
Each of the following sentences is true regarding homologous recombination except
A) The frequency of recombination is uniform across the genome. B) Homologous recombination involves RecA in prokaryotes and RAD51 in eukaryotes. C) Homologous recombination resolves the repaired strands using a Holliday junction. D) Homologous recombination involves a process known as homology searching. E) Homologous recombination involves the formation of a synaptonemal complex.