Consider the following electronegativity values:Boron (B) = 1.8Carbon (C) = 2.5Chlorine (Cl) = 3.2Selenium (Se) = 2.6Which of the following bonds is the most polar?
A. B-Cl
B. Se-Cl
C. C-Cl
D. cannot determine from the information provided
Answer: A
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Diazotrophs maximize nitrogenase activity by
A) closely coupling N2 fixation with high rates of photosynthesis. B) fixing N2 at times when oxygen is absent or in low concentrations. C) producing specialized structures to protect nitrogenase from oxygen. D) producing specialized structures or fixing N2 at times when oxygen is absent to protect nitrogenase from oxygen.
The virulence of this organism(s), which is transmitted via a dog bite, is attributed to:
a. protease production. b. various toxins. c. hemolysins. d. something unknown.
The Cerulean warbler is a songbird that breeds in the eastern and middle United States and winters in Central America. Its numbers have been rapidly declining over the past 50 years. You are interested in the reason(s) for this rapid decline and set about to make observations and gather data. The graph above shows data you collected on the abundance of Brown cowbirds (nest parasites) and Cerulean warblers at various locations. Based on a visual inspection of the graph, what can you conclude?
A. Brown cowbird abundance is significantly correlated with Cerulean warbler abundance. B. The abundance of Brown cowbirds shows a positive relationship with Cerulean warbler abundance. C. The abundance of Brown cowbirds shows a negative relationship with Cerulean warbler abundance. D. Brown cowbirds do not appear to affect Cerulean warblers. E. Brown cowbirds are responsible for the decline of the Cerulean warbler.
In Drosophila, the sex of a fly with the karyotype ________ is male
A) XYY:4A B) XO:2A C) XXX:2A D) XXY:2A E) XX:2A