The neurotransmitter acetylcholine is
A) always excitatory in the human body.
B) not broken down in the synaptic cleft.
C) actively transported back into synaptic terminals.
D) None of the above.
Ans: D) None of the above.
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The chemical cochicine, from a flowering plant, blocks the building of tubulin proteins into microtubules. This would cause cell damage by
A) reducing the production of ATP that the cell can make. B) blocking cell division. C) reducing cell transport. D) inhibiting DNA replication. E) inhibiting lipid production.
Inadequate dietary iodine can lead to:
a. increased T3 production b. increased T4 production c. Graves' disease d. hypothyroidism e. hyperthyroidism
In the sarcomere the protein that forms two twisted strands around a central rod-like protein is called
A) titin B) actin C) G actin D) nebulin E) myosin
All of the following processes can move substances out of a cell EXCEPT ________.
A. phagocytosis B. exocytosis C. active transport D. diffusion E. osmosis