The operation of a synapse
a. results from the passage of an electrical charge across the gap.
b. involves a transmitter substance from vesicles in the presynaptic neuron that acts upon a
receptor site in the postsynaptic neuron.
c. occurs only between two nerves.
d. is limited only by the action of acetylcholinesterase.
e. requires neurotransmitter to pass directly through the plasma membrane of a postsynaptic
nerve.
B
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Which plant organs are often connected to a petiole, may be either simple or compound, and are typically the main organs of photosynthesis and gas exchange?
a. trichomes b. flowers c. stems d. leaves
You are a physician treating a patient with cancer. Traditional chemotherapy has not been working on this patient, so you prescribe a new class of drugs called taxanes, which inhibit microtubule function. Your patient asks you how they work. How would
you explain to your patient how these drugs work? What will be an ideal response?
If one compares the forearm of a human, dog, bird, and whale and finds that they indicate common ancestry, what would we call these structures?
a. vestigial structures b. archetype features c. homologous structures d. ancestral forms
In transcription,
a. several RNA molecules are made from the same DNA molecule. b. a promoter sequence is needed. c. DNA produces messenger RNA. d. a specific enzyme called RNA polymerase is required. e. all of these occur.