An excitatory postsynaptic potential
a. is only one of several types of graded potential.
b. has a hyperpolarizing effect.
c. will drive the membrane away from its threshold.
d. is summed with an inhibitory postsynaptic potential at the input zone of a neuron in a
process known as synaptic integration.
e. help keep the membrane at resting membrane potential.
D
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Synovial joints are held together by ____
a. muscle fibers b. sarcomeres c. tendons d. ligaments e. myofibrils
The E. coli chromosome is
A) linear. B) circular. C) single-stranded. D) less than a megabase in length. E) compartmentalized within an intracellular membrane.
A large group of molecules involved in signaling and regulation of defense responses are:a
complement. b. prostaglandins. c. opsonins. d. cytokines. e. histamines
Triclosan is a phenolic compound present in some hand sanitizers that targets a specific protein mediating fatty acid synthesis. Are microbes more or less likely to develop resistance to triclosan than to alcohol?
A. More likely, since we use more triclosan overall than alcohol. B. Less likely, since we use more alcohol overall than triclosan. C. More likely, since triclosan has a specific target which can be altered genetically, whereas alcohol's surfactant properties cannot be avoided. D. Less likely, since the cell membrane structure can be altered genetically to resist the surfactant properties of alcohol, whereas triclosan kills the cell outright.