________ are cancers that originate in epithelial cells and comprise 90% of all cancers.
Fill in the blank(s) with the appropriate word(s).
Carcinomas
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Place the following events in the order in which they occur for chemical synapse transmission
(1) Ca2+ enters axon terminal. (2) Ligand-gated ion channels open in postsynaptic membrane. (3) Neurotransmitter binds to postsynaptic receptor. (4) Action potential reaches axon terminal of presynaptic neuron. (5) Neurotransmitter released by exocytosis.
a. 4, 1, 5, 3, 2 b. 4, 3, 1, 5, 2 c. 4, 5, 1, 3, 2 d. 4, 1, 3, 5, 2 e. 4, 5, 2, 3, 1
Which process is responsible for the conversion of DNA information into messenger RNA?
a. replication b. transcription c. duplication d. translation
e. synthesisThe layer of the gastrointestinal tract wall that is responsible for motility is the
A) muscularis. B) mucosa. C) serosa. D) submucosa. E) glandular.
Which of the following statements is incorrect?
A) Enzymes raise the activation energy of a reaction. B) Enzymes speed up the rate of a reaction. C) Substrates bind to an enzyme's active site. D) Enzymes change shape when they bind to a substrate.