Target cells are:
a. found only in specific endocrine glands
b. endocrine cells
c. muscle cells
d. always hormone-producing
e. equipped with specific receptor molecules and may occur in any part of the body
e
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The best control for your experiment in the question above is a tree in which you __________ and you measure the abundance of _____________ over time. remove the ants and the aphids; other insects
A. do not remove any insects; ants B. do not remove any insects; aphids C. add a second ant species; the first ant species D. Actually, the control is built into the original experiment; you do not need to set up a separate control.
Which of the following NOT a function of a nervous system?
a. communication b. interpretation of information c. detection of changes in the internal environment d. monitoring changes in the external environment e. regenerating nerve nets
One difference between the ion channel-linked receptors for GABA and acetylcholine is that when
GABA binds its receptor:a. muscle contraction is inhibited. b. sodium ions enter the cell. c. muscle contraction is stimulated. d. neural signaling is inhibited. e. chloride ions rush out of the neuron.
Using powerful new sequencing technologies, investigators can now catalog every RNA molecule made by a cell and determine at what quantities these RNAs are present. In an experiment, researchers measured the relative quantities of two different mRNAs—one transcribed from gene A, the other from gene B—in two different cell types. Gene B is expressed in both the liver and the brain whereas gene A is expressed in the brain but not in the liver. Which most likely encodes a housekeeping protein?
A. gene B only B. gene A only C. both genes D. neither gene