Signals are sent from one neuron to another at a synapse, where vesicles release molecules of ________ that travel to the postsynaptic cell
a. sodium ions
b. calcium ions
c. neurotransmitter
d. potassium ions
c
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A promoter controls ________
a. transcription of specific genes b. mRNA translation c. protein synthesis d. DNA replication
The absolute refractory period refers to the brief period of time:
A) during which a postsynaptic receptor cannot bind another neurotransmitter after is has been open B) after a neuron has fired an action potential during which the same neuron cannot fire another action potential C) after exocytosis and before the release of more neurotransmitter from the presynaptic cleft D) following a response to a difficult exam questions during which no other information can be processed
Which sequence presents the five steps of digestion in an upper-level animal in the proper order?
a. mechanical processing, secretion of enzymes, absorption, enzymatic hydrolysis, elimination b. mechanical processing, absorption, secretion of enzymes, enzymatic hydrolysis, elimination c. mechanical processing, secretion of enzymes, enzymatic hydrolysis, absorption, elimination d. absorption, enzymatic hydrolysis, mechanical processing, secretion of enzymes, elimination
The origins of 300 or more species of cichlid fish in Lake Malawi can best be explained by
A) adaptive radiation. B) the fossil record. C) polyploidy. D) premating isolating mechanisms. E) random events.