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Pre-Test
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1
Which of the following characteristics of living organisms would include cell signaling?
A)adaptation
B)communication
C)evolution
D)metabolism
E)homeostasis
2
A ligand is most accurately defined as a(n)
A)transcription factor that promotes increased production of a particular protein in response to an environmental change.
B)receptor molecule that binds a signaling molecule sent from another cell.
C)enzyme that alters cellular metabolism as a response to a received signal.
D)cytoskeletal element that alters its shape to promote movement of a cell.
E)signaling molecule that binds to a cellular receptor.
3
Small or large signaling molecules unable to pass through the plasma membrane must utilize ____________________ to gain entry.
A)first messengers
B)second messengers
C)cell-surface receptors
D)transmembrane proteins
E)intracellular receptors
4
True or False: Genetically predetermined cell death is known as apoptosis.
A)True
B)False





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