An atom carries no charge because it has as many electrons as ____
a. protons
b. neutrons
c. orbitals
d. neutrinos
e. shells
ANSWER: a
Biology & Microbiology
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In vertebrates, the neurotransmitter acetylcholine
a. can act as a direct neurotransmitter between neurons and muscle cells. b. can make it more difficult for some postsynaptic membranes to reach threshold. c. can be released into circulation and act as a hormone. d. can act as a pain reducer and initiate euphoria. e. a and b only
Biology & Microbiology
During a human pregnancy, implantation occurs at the blastocyst stage
1.True 2.False
Biology & Microbiology
Uniparental disomy can arise through nondisjunction in _____
1.meiosis 2.the early embryo 3.the zygote 4.all of the choices
Biology & Microbiology
Shallow water above the continental shelves is the:
1.Benthic region
2.Coastal zone
3.Neritic zone
4.Open ocean
5.Pelagic zone