While the maximum number of electrons required to fill the outermost shell of an atom varies depending on the size of the atom, almost all of the smaller atoms (atomic numbers 2-20 ) are considered stable (nonreactive) when they contain ________

electron(s) in the outermost shell. A) 1
B) 2
C) 8
D) 16


C

Biology & Microbiology

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The usual cause of genital herpes is

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Translation begins when the DNA in a chromosome unwinds and one strand is used as a template to make a pre-mRNA

molecule. a. True b. False

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Duffy factor is due to a chemical that occurs on the membranes of red blood cells and is sometimes used as a blood-typing attribute in the same way that ABO and Rh factor blood types are used

Recent research has found that people with Duffy factor are about 40% less likely to be infected with HIV, given similar circumstances. Given that HIV affects white blood cells, how would you characterize the Duffy factor gene, and why?

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During the winter in the northern coniferous forests, bears hibernate until food becomes more plentiful. What level of biological organization is illustrated?

A) multicelled organism B) population C) community D) ecosystem E) biosphere

Biology & Microbiology