Brain waves during sleep are ____ waves
A) theta B) delta C) alpha D) beta
B
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During embryonic development, blood cells are formed from
a) endodermal cells. b) pluripotent stem cells. c) angioblasts. d) fibroblasts. e) osteoblasts.
The formula for methane gas is CH4. What does the formula 4CH4 represent?
A) a molecule with 4 carbon atoms B) a molecule with 4 carbon atoms and 16 hydrogen atoms C) 4 molecules, each containing a carbon and a hydrogen atom D) 4 molecules, each containing a carbon atom and 4 hydrogen atoms E) an inorganic compound with ionic bonds
Ionic bonds are formed when
A) atoms share electrons. B) electrons are completely transferred from one atom to another. C) a pair of electrons is shared unequally by two atoms. D) hydrogen forms bonds with negatively charged atoms. E) two or more atoms lose electrons at the same time.