At what point during excitation contraction coupling does exocytosis play a role?
A) during calcium ion reuptake into the sarcoplasmic reticulum
B) when sodium channels open up on the motor end plate
C) during acetylcholine release from the synaptic terminal
D) when the action potential surges through the T-tubules
E) when ATP splits into ADP and P on the free myosin head
C
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The disease rabies is caused by a virus that attacks the central nervous system. The virus is normally introduced when an infected animal bites another, breaking the surface of the skin and allowing the entry of saliva containing the virus. Since the virus cannot move by itself, how does it get to neurons in the central nervous system?
What will be an ideal response?
The enzyme ________ is required for the synthesis of mRNA
A) RNA polymerase B) deoxyribase C) phosphatase D) RNA synthetase E) ribase
In which structure do sound waves first pass?
a. cochlear duct b. scala media c. scala tympani d. scala vestibuli e. helicotrema
Select the structure that is not located in the cytosol of the cell
a. ER. b. golgi complex. c. lysosome. d. mitochondrion. e. all of the above are located in the cytosol