Biology, Eighth Edition (Raven)

Chapter 9: Cell Communication

Pre Test

1
Which method of communication is most often observed between nerve cells? (p. 167)
A)Paracrine
B)Direct contact
C)Synaptic
D)Endocrine
E)Two of the above
2
What is a ligand? (p. 168)
A)Something that crosses the plasma membrane
B)A molecule which infuses itself into the fatty acid region of a phospholipids bilayer
C)Structures which contain a lot of energy
D)A substance which binds to receptors on the surface of a cell
E)A chemical which alters the primary structure of a protein
3
Recall from chapter 3, that protein domains are important in the function of the protein. What is the minimum number of functional domains required for a typical intracellular receptor protein? (p. 170)
A)1
B)2
C)3
D)4
E)5
4
What is the purpose of signal amplification? (p. 174)
A)It stimulates many pathways that will all result in the same outcome.
B)It allows for different messages to be created during a signaling event.
C)It is the mechanism of protein phosphorylation.
D)It allows a threshold to be achieved so that a dilute ligand can quickly cause a reaction.
E)Two of the above achieve the purpose.
5
Some proteins are named as "G proteins". What does the "G" stand for? (p. 176)
A)Great
B)Golgi body activating
C)GTP hydrolyzing
D)Guanine binding
E)Glutin synthesizing
6
The term "glycolipid" refers to a molecule constructed from which macromolecule classes? (p. 180)
A)Polysaccharides and nucleotides
B)Nucleic acids, polypeptides, and polysaccharides
C)Polypeptides, lipids, and nucleotides
D)Only polysaccharides and lipids
E)Only lipids and polypeptides
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