Question 1

Which of the following is LEAST likely involved in calcium signaling?

Accepted Answer

A)   IP3
B)   calmodulin
C)   protein kinase A
D)   protein kinase C
E)   phospolipase CF) B) and D)
G) A) and B)

Question 2

Which of the following is NOT an example of how differential gene regulation affects cellular response?

Accepted Answer

A)   The expression of proteins that are controlled by signal transduction pathways may vary in different cell types.
B)   Cell junctions passing ions between the cytosol of one cell to another cell.
C)   A cell may or may not express a receptor for a particular signaling molecule.
D)   The expression of proteins involved in intracellular signal transduction pathways may vary in different cell types
E)   Different cell types have different cell surface receptors that recognize the same signaling molecules.F) A) and B)
G) A) and C)

Question 3

Which of the following is capable of dephosphorylating molecules?

Accepted Answer

A)   phospholipase C
B)   protein kinase A
C)   Grb2/Sos/Ras complex
D)   phosphatase
E)   IP3F) B) and E)
G) A) and E)

Question 4

Estrogen is most likely to exert its effects by regulating

Accepted Answer

A)   protein kinases.
B)   phopholipase C.
C)   expression of genes and production of specific proteins.
D)   cyclic AMP.
E)   Ca2+.F) A) and B)
G) A) and C)

Question 5

Once bound to a hormone, this receptor becomes active and catalyzes the transfer of a phosphate group to itself or intracellular proteins.

Accepted Answer

A)   G-protein coupled receptor
B)   enzyme-linked receptor
C)   ligand-gated ion channel receptor
D)   mechanoreceptor
E)   thermoreceptorF) None of the above
G) B) and D)

Question 6

Which of the following types of molecules is LEAST involved in cell communication?

Accepted Answer

A)   carbohydrates
B)   lipids
C)   steroids
D)   proteins
E)   neurotransmittersF) All of the above
G) A) and C)

Question 7

What type of cell communication is said to occur if a cell secretes a growth factor that then acts on neighboring cells to cause them to proliferate?

Accepted Answer

A)   contact-to-contact signaling
B)   intercellular signaling
C)   autocrine signaling
D)   paracrine signaling
E)   endocrine signalingF) None of the above
G) All of the above

Question 8

A G-protein coupled receptor associates with a G protein that contains how many subunits?

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4F) None of the above
G) B) and E)

Question 9

Which molecule is directly responsible for breaking down cAMP to inactive AMP?

Accepted Answer

A)   protein kinase A
B)   adenylyl cyclase
C)   phosphodiesterase
D)   GTPase
E)   protein phosphataseF) B) and C)
G) A) and E)

Question 10

What type of receptor does IP3 bind?

Accepted Answer

A)   G-protein coupled
B)   ligand-gated Ca2+ channel
C)   enzyme-linked
D)   sensor kinase
E)   phospholipase type-IF) A) and E)
G) B) and D)

Question 11

During exposure to elevated glucose, a yeast cell's membrane glucose transporters will rapidly increase so the cell can import glucose. Which would represent the yeast cell response?

Accepted Answer

A)   increased membrane glucose transporters
B)   increased membrane glucose receptors
C)   increased glucose transport into the cell
D)   both increased membrane glucose transporters and glucose receptors
E)   both increased membrane glucose transporters and glucose transport into the cellF) C) and E)
G) A) and B)

Question 12

Apoptosis is necessary in humans in order to eliminate cells infected by viruses, cells that are worn out, and those that have the potential to cause cancer.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following order of events is most accurate for activation of G-protein coupled receptor (GPCR)  signaling pathways?

Accepted Answer

A)   Hormone binds GPCR, GPCR binds with G protein, G protein loses GDP and gains GTP, G-protein alpha subunit activates intracellular proteins.
B)   Hormone binds GPCR, G protein loses GDP and gains GTP, GPCR binds with G protein, G-protein alpha subunit activates intracellular proteins.
C)   Hormone binds GPCR, GPCR binds with G protein, G-protein alpha subunit activates intracellular proteins, G protein loses GDP and gains GTP.
D)   Hormone binds GPCR, G protein loses GDP and gains GTP, G-protein alpha subunit activates intracellular proteins, GPCR binds with G protein.
E)   GPCR binds with G protein, hormone binds GPCR, G protein loses GDP and gains GTP, G-protein alpha subunit activates intracellular proteins.F) B) and C)
G) All of the above

Question 14

What do synaptic signaling and paracrine signaling have in common?

Accepted Answer

A)   Cells release a signal that affects it and neighboring cells.
B)   Cells release a signal that affects cells at long distances.
C)   Cells release a signal through gap junctions to affect neighboring cells.
D)   Cells bind a membrane bound signal on a neighboring cell.
E)   Cells release a signal that affects neighboring cells.F) C) and D)
G) All of the above

Question 15

Which of the following represents the correct sequence of events in the cAMP signal transduction pathway?

Accepted Answer

A)   G protein?cAMP?adenylyl cyclase?protein kinase A?cell response
B)   G protein?adenylyl cyclase?protein kinase A?cAMP?cell response
C)   G protein?protein kinase A?adenylyl cyclase?cAMP?cell response
D)   G protein?adenylyl cyclase?cAMP?protein kinase A?cell response
E)   adenylyl cyclase?G protein?cAMP?protein kinase A?cell responseF) B) and C)
G) All of the above

Question 16

Adenylyl cyclase is to cAMP as ________ is to IP3.

Accepted Answer

A)   protein kinase A
B)   protein kinase C
C)   calmodulin
D)   Raf1
E)   phospholipase CF) A) and B)
G) A) and C)

Question 17

All of the following are general components of the growth factor signaling pathway EXCEPT

Accepted Answer

A)   tyrosine kinase-linked receptor.
B)   GRB2-Sos-Ras complexes.
C)   phosphorylated transcription factors.
D)   Raf-1.
E)   IP3 and Ca2+.F) A) and B)
G) B) and D)

Question 18

Which of the following is not a common way signals are relayed between cells?

Accepted Answer

A)   Contact-dependent signaling
B)   Autocrine signaling
C)   Direct intercellular signaling
D)   Paracrine signaling
E)   All of the above are ways signals are relayed between cellsF) A) and B)
G) B) and E)

Question 19

What type of signaling occurs when insulin is secreted from the pancreas and acts on muscle cells to increase glucose uptake?

Accepted Answer

A)   contact-to-contact signaling
B)   intercellular signaling
C)   autocrine signaling
D)   paracrine signaling
E)   endocrine signalingF) B) and C)
G) A) and E)

Question 20

When assembling a fish aquarium one must add a conditioner to the water that contains bacteria capable of metabolizing fish waste such as ammonia, nitrate, and nitrite that accumulates in the aquaria water. Which of the following components of signal reception and transduction is NOT required for the bacterial two-component regulatory system for metabolizing these nitrogenous waste products?

Accepted Answer

A)   NarQ receptor
B)   NarL transcriptional activator
C)   a protein kinase
D)   metabolic enzymes
E)   ligand-gated calcium channelF) None of the above
G) All of the above

Exam 9: Cell Communication

A G-protein coupled receptor associates with a G protein that contains how many subunits?

Correct Answer
verified

What type of signaling occurs when insulin is secreted from the pancreas and acts on muscle cells to increase glucose uptake?

Correct Answer
verified

Which of the following is NOT an example of how differential gene regulation affects cellular response?

Correct Answer
verified

Which molecule is directly responsible for breaking down cAMP to inactive AMP?

Correct Answer
verified

Which of the following order of events is most accurate for activation of G-protein coupled receptor (GPCR) signaling pathways?

Correct Answer
verified

Estrogen is most likely to exert its effects by regulating

Correct Answer
verified

What type of receptor does IP₃ bind?

Correct Answer
verified

What do synaptic signaling and paracrine signaling have in common?

Correct Answer
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Correct Answer
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All of the following are general components of the growth factor signaling pathway EXCEPT

Correct Answer
verified

Which of the following represents the correct sequence of events in the cAMP signal transduction pathway?

Correct Answer
verified

Which of the following is capable of dephosphorylating molecules?

Correct Answer
verified

Which of the following is LEAST likely involved in calcium signaling?

Correct Answer
verified

During exposure to elevated glucose, a yeast cell's membrane glucose transporters will rapidly increase so the cell can import glucose. Which would represent the yeast cell response?

Correct Answer
verified

Which of the following is not a common way signals are relayed between cells?

Correct Answer
verified

What type of cell communication is said to occur if a cell secretes a growth factor that then acts on neighboring cells to cause them to proliferate?

Correct Answer
verified

Which of the following types of molecules is LEAST involved in cell communication?

Correct Answer
verified

Once bound to a hormone, this receptor becomes active and catalyzes the transfer of a phosphate group to itself or intracellular proteins.

Correct Answer
verified

Adenylyl cyclase is to cAMP as ________ is to IP₃.

Correct Answer
verified

Apoptosis is necessary in humans in order to eliminate cells infected by viruses, cells that are worn out, and those that have the potential to cause cancer.

Correct Answer
verified

Exam 9: Cell Communication

A G-protein coupled receptor associates with a G protein that contains how many subunits?

Correct AnswerverifiedShow Answer

What type of signaling occurs when insulin is secreted from the pancreas and acts on muscle cells to increase glucose uptake?

Correct AnswerverifiedShow Answer

Which of the following is NOT an example of how differential gene regulation affects cellular response?

Correct AnswerverifiedShow Answer

Which molecule is directly responsible for breaking down cAMP to inactive AMP?

Correct AnswerverifiedShow Answer

Which of the following order of events is most accurate for activation of G-protein coupled receptor (GPCR) signaling pathways?

Correct AnswerverifiedShow Answer

Estrogen is most likely to exert its effects by regulating

Correct AnswerverifiedShow Answer

What type of receptor does IP3 bind?

Correct AnswerverifiedShow Answer

What do synaptic signaling and paracrine signaling have in common?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

All of the following are general components of the growth factor signaling pathway EXCEPT

Correct AnswerverifiedShow Answer

Which of the following represents the correct sequence of events in the cAMP signal transduction pathway?

Correct AnswerverifiedShow Answer

Which of the following is capable of dephosphorylating molecules?

Correct AnswerverifiedShow Answer

Which of the following is LEAST likely involved in calcium signaling?

Correct AnswerverifiedShow Answer

During exposure to elevated glucose, a yeast cell's membrane glucose transporters will rapidly increase so the cell can import glucose. Which would represent the yeast cell response?

Correct AnswerverifiedShow Answer

Which of the following is not a common way signals are relayed between cells?

Correct AnswerverifiedShow Answer

What type of cell communication is said to occur if a cell secretes a growth factor that then acts on neighboring cells to cause them to proliferate?

Correct AnswerverifiedShow Answer

Which of the following types of molecules is LEAST involved in cell communication?

Correct AnswerverifiedShow Answer

Once bound to a hormone, this receptor becomes active and catalyzes the transfer of a phosphate group to itself or intracellular proteins.

Correct AnswerverifiedShow Answer

Adenylyl cyclase is to cAMP as ________ is to IP3.

Correct AnswerverifiedShow Answer

Apoptosis is necessary in humans in order to eliminate cells infected by viruses, cells that are worn out, and those that have the potential to cause cancer.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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What type of receptor does IP₃ bind?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Adenylyl cyclase is to cAMP as ________ is to IP₃.

Correct Answer
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Correct Answer
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