For an atom to achieve maximum stability and become chemically inert, what must occur?
A) Ionization occurs.
B) Its outermost energy shell must be completely filled with electrons.
C) The number of electrons must equal the number of protons.
D) Electron pairs are shared.
B
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________ and ________ have been demonstrated to trigger DNA mutation associated with particular geographical cancers.
Fill in the blank(s) with the appropriate word(s).
Microtubules that form the mitotic spindle tend to originate from or terminate in
a. centromeres and telomeres. b. euchromatin. c. centrioles and telomeres. d. the nuclear envelope. e. centrioles and kinetochores.
Plasma from a sick mouse is filtered across a membrane that has a 200 nm pore size. If the filtrate is still infectious when injected into a healthy mouse, then the pathogen is most likely a(n):
A. parasitic worm B. bacterium C. archaean D. virus E. fungus
Osmolarity is the
A) pH concentration of a solution. B) ratio of oxygen to carbon dioxide. C) pressure within a closed system. D) concentration of dissolved solutes in solution.