What is the function of the nodes of Ranvier?
a. regenerate resting membrane potential after an action potential
b. reduce current leakage from unmyelinated axon regions
c. speed up action potential propagation by salutatory conduction
d. store excess sodium and potassium ions between action potentials
c. speed up action potential propagation by salutatory conduction
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Archaeans and bacteria are generally included in the:
a. seston. b. tripton. c. bacterioplankton. d. viriplankton. e. pleuston.
What is the maximum length of a polypeptide encoded by an mRNA that is 45 nucleotides long?
What will be an ideal response?
In an ionic bond,
A. two atoms are attracted by partial positive and negative charges. B. two atoms are attracted by the same charges. C. atoms attract each other by sharing electrons to fill their valence shells. D. atoms, having gained or lost electrons, attract one another with opposite charges. E. two atoms both become strongly electronegative and attract each other.
Enkephalins and endorphins are
a. neuromodulators. b. stimulators of brain and nervous activity. c. inhibitors of pain perception. d. neuromodulators and stimulators of brain and nervous activity. e. neuromodulators and inhibitors of pain perception