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.   Protein kinase A
B.   Protein phosphatase
C.   Adenylyl cyclase
D.   MAP kinase kinase (Erk)
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 inhibition of cAMP
B.   An increase in cAMP
C.   An increase in cyclic AMP phosphodiesterase
D.   An increase in phospholipase C-β
E.   Production of IP3
Question #3
Which of the following statements about the cytoskeleton is false?
A.   The cytoskeleton is made up of three types of protein filaments.
B.   Covalent bonds between protein monomers hold together cytoskeletal filaments.
C.   The cytoskeleton controls the location of organelles in eukaryotic cells.
D.   The cytoskeleton of a cell can change in response to the environment.
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 of the polarity in the monomers
C.   Because the triphosphate form of the monomer prefers the plus end
D.   Because the minus end repels monomers
Question #5
Unlike a myosin head, a kinesin head is tightly bound to its cytoskeletal filament when bound to …
A.   GTP
B.   ADP
C.   ATP
D.   GDP
E.   no nucleotide

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