Biology 380 - Cell Biology » Summer 2022 » Quiz 5, Ch 15 and 16

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Question #1
Which of the following is responsible for cleaving PI 4,5-bisphosphate (PIP2) into diacyglycerol and IP3?
A.   MAP kinase kinase (Erk)
B.   Adenylyl cyclase
C.   Protein kinase A
D.   Protein phosphatase
E.   Phospholipase C
Question #2
If a G protein-coupled receptor is associated with a G protein containing a Gi subunit, you would expect to see which of the following in response to ligand binding to the receptor.
A.   An increase in cyclic AMP phosphodiesterase
B.   An increase in cAMP
C.   Production of IP3
D.   An increase in phospholipase C-β
E.   An inhibition of cAMP
Question #3
Which of the following statements about the cytoskeleton is false?
A.   Covalent bonds between protein monomers hold together cytoskeletal filaments.
B.   The cytoskeleton of a cell can change in response to the environment.
C.   The cytoskeleton is made up of three types of protein filaments.
D.   The cytoskeleton controls the location of organelles in eukaryotic cells.
Question #4
The reason that addition of monomers to a cytoskeletal polymer occurs faster at the plus end compared to the minus end is:
A.   Because the plus end attracts monomers
B.   Because the triphosphate form of the monomer prefers the plus end
C.   Because the minus end repels monomers
D.   Because of the polarity in the monomers
Question #5
Unlike a myosin head, a kinesin head is tightly bound to its cytoskeletal filament when bound to …
A.   ADP
B.   GTP
C.   no nucleotide
D.   ATP
E.   GDP

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