Biology, Eighth Edition (Raven)

Chapter 9: Cell Communication

Post Test

1
Which functional group provides the most common alteration of protein tertiary and quaternary structure, thereby mediating its activity? (p. 168)
A)Sulfhydryl
B)Hydroxyl
C)Phosphate
D)Tyrosine
E)Methyl
2
Which of the following are common secondary messengers? (p. 170)
A)ATP
B)cAMP
C)Calcium
D)All of the above
E)Two of the above
3
What property must a molecule have to cross a membrane and initiate a response? (p. 171)
A)It must have hydrophilic properties
B)It must have hydrophobic properties
C)It must have sulfur in its structure
D)It must degrade DNA
E)It needs to have many alpha helices
4
Why are some ligand substances potential carcinogens? (p. 172)
A)They can stimulate the cell to divide too often
B)They can trick a cell into creating more surface receptors
C)By binding to a receptor, they have ambiguous messages
D)All of the above
E)Two of the above.
5
Why are receptor proteins important to a cell's well-being? (p. 179)
A)Some messengers cannot cross the plasma membrane and therefore need a mechanism to activate a response
B)Cells are very busy centers of activity and therefore need to have a mechanism to "wake them up" and respond
C)Proteins are simple structures and need sophisticated mechanisms to enable them to do their job
D)Proteins accidentally bind to sugars, and it's the receptor proteins which correct these mistakes
E)Receptor proteins stimulate ribosomes to create proteins appropriate for the signaled event
6
Which type of cell junction would best serve to prevent cardiac (heart muscle) cells from separating? (p. 181)
A)Tight junctions
B)Gap Junctions
C)Desmosomes
D)Communicating junctions
E)All of the above are equally effective in preventing separation
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