Question 1

Differentiation of blood cells and control of lymphocytes during the immune response is regulated by which type of signaling molecule?

Accepted Answer

A)  Enkephalins 
B)  Fibroblast growth factor 
C)  Platelet derived growth factor 
D)  Cytokines 
A)  Enkephalins 
B)  Fibroblast growth factor 
C)  Platelet derived growth factor 
D)  Cytokines

Question 2

In animal cells, the common growth factor, or mitogen-activated protein kinase signaling pathway, starts with phosphorylation of tyrosines on the cytosolic domains of the receptor by a process called _______.

Accepted Answer

The answer of In animal cells, the common growth factor,...

Question 3

The region of a gene that binds to a PKA phosphorylated protein is a _______.

Accepted Answer

cAMP respo

Question 4

Protein X is activated by protein kinase A. A mutation in protein X that replaces the protein's only serine residue with an arginine residue would be expected to

Accepted Answer

A)  increase activation of protein X. 
B)  eliminate activation of protein X. 
C)  have no effect on activation of protein X. 
D)  prevent inactivation of protein X. 
A)  increase activation of protein X. 
B)  eliminate activation of protein X. 
C)  have no effect on activation of protein X. 
D)  prevent inactivation of protein X.

Question 5

How would a mutation in CREB that prevents its phosphorylation affect cAMP signaling?

Accepted Answer

It would prevent transcription

Question 6

Describe three features shared by protein-tyrosine kinase growth factor receptors.

Accepted Answer

(1) An N-terminal extracellula

Question 7

In unstimulated cells, NF-$\kappa$B proteins are maintained in an inactive state in the cytosol by interactions with

Accepted Answer

A)  Hedgehog. 
B)  I$\kappa$B 
C)  adaptor proteins. 
D)  the TNF receptor. 
A)  Hedgehog. 
B)  I$\kappa$B 
C)  adaptor proteins. 
D)  the TNF receptor.

Question 8

Intracellular signaling pathways provide multiple opportunities for the amplification of a response to an extracellular signal.

Accepted Answer

A) True 
 B)False

Question 9

In the signaling of cells to initiate growth, immediate early genes become activated to initiate the growth process. What would happen to the expression of these immediate early genes if Elk-1 was not able to be dephosphorylated, and why?

Accepted Answer

The immediate early genes would be const

Question 10

MAP kinase signal cascades are often organized into functional groups or cassettes by

Accepted Answer

A)  scaffold proteins. 
B)  binding of SH2 domains to each other. 
C)  lipid rafts. 
D)  binding MAP kinase-responsive genes. 
A)  scaffold proteins. 
B)  binding of SH2 domains to each other. 
C)  lipid rafts. 
D)  binding MAP kinase-responsive genes.

Question 11

During the odorant response in the cilia of olfactory neurons, the second messenger _______, leads to the opening of ion channels in the plasma membrane of olfactory neurons and the production of a nerve impulse.

Accepted Answer

A)  Ca2+ 
B)  cAMP 
C)  cGMP 
D)  IP3 
A)  Ca2+ 
B)  cAMP 
C)  cGMP 
D)  IP3

Question 12

The MEK kinase (MAP kinase/ERK kinase) is unusual in that it

Accepted Answer

A)  is activated by a kinase. 
B)  lies downstream of G protein-coupled receptors. 
C)  is a dual-specificity kinase, having the ability to phosphorylate both threonines and tyrosines. 
D)  activates a kinase. 
A)  is activated by a kinase. 
B)  lies downstream of G protein-coupled receptors. 
C)  is a dual-specificity kinase, having the ability to phosphorylate both threonines and tyrosines. 
D)  activates a kinase.

Question 13

Growth factors and cytokines both lead to tyrosine phosphorylation through receptors, but they do so through different mechanisms. What is the key difference between the receptors for these two classes of ligands in terms of their tyrosine kinase activity?

Accepted Answer

The receptors for growth factors such as

Question 14

What is the family of receptors for most growth factors?

Accepted Answer

Receptor t

Differentiation of blood cells and control of lymphocytes during the immune response is regulated by which type of signaling molecule?

In animal cells, the common growth factor, or mitogen-activated protein kinase signaling pathway, starts with phosphorylation of tyrosines on the cytosolic domains of the receptor by a process called _______.

The region of a gene that binds to a PKA phosphorylated protein is a _______.

Protein X is activated by protein kinase A. A mutation in protein X that replaces the protein's only serine residue with an arginine residue would be expected to

How would a mutation in CREB that prevents its phosphorylation affect cAMP signaling?

Describe three features shared by protein-tyrosine kinase growth factor receptors.

In unstimulated cells, NF- $\kappa$ B proteins are maintained in an inactive state in the cytosol by interactions with

Intracellular signaling pathways provide multiple opportunities for the amplification of a response to an extracellular signal.

In the signaling of cells to initiate growth, immediate early genes become activated to initiate the growth process. What would happen to the expression of these immediate early genes if Elk-1 was not able to be dephosphorylated, and why?

MAP kinase signal cascades are often organized into functional groups or cassettes by

During the odorant response in the cilia of olfactory neurons, the second messenger _______, leads to the opening of ion channels in the plasma membrane of olfactory neurons and the production of a nerve impulse.

The MEK kinase (MAP kinase/ERK kinase) is unusual in that it

Growth factors and cytokines both lead to tyrosine phosphorylation through receptors, but they do so through different mechanisms. What is the key difference between the receptors for these two classes of ligands in terms of their tyrosine kinase activity?

What is the family of receptors for most growth factors?

An Overview of Cells and Cell Research

Molecules and Membranes

Bioenergetics and Metabolism

Fundamentals of Molecular Biology

Genomics, Proteomics, and Systems Biology

Genes and Genomes

Replication, Maintenance, and Rearrangements of Genomic Dna

RNA Synthesis and Processing

Transcriptional Regulation and Epigenetics

Protein Synthesis, Processing, and Regulation

The Nucleus

Protein Sorting and Transport

Mitochondria, Chloroplasts, and Peroxisomes

The Cytoskeleton and Cell Movement

The Plasma Membrane

Cell Walls, the Extracellular Matrix, and Cell Interactions

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters

Exam 17: Cell Signaling

Differentiation of blood cells and control of lymphocytes during the immune response is regulated by which type of signaling molecule?

In animal cells, the common growth factor, or mitogen-activated protein kinase signaling pathway, starts with phosphorylation of tyrosines on the cytosolic domains of the receptor by a process called _______.

The region of a gene that binds to a PKA phosphorylated protein is a _______.

Protein X is activated by protein kinase A. A mutation in protein X that replaces the protein's only serine residue with an arginine residue would be expected to

How would a mutation in CREB that prevents its phosphorylation affect cAMP signaling?

Describe three features shared by protein-tyrosine kinase growth factor receptors.

In unstimulated cells, NF- κ\kappaκ B proteins are maintained in an inactive state in the cytosol by interactions with

Intracellular signaling pathways provide multiple opportunities for the amplification of a response to an extracellular signal.

In the signaling of cells to initiate growth, immediate early genes become activated to initiate the growth process. What would happen to the expression of these immediate early genes if Elk-1 was not able to be dephosphorylated, and why?

MAP kinase signal cascades are often organized into functional groups or cassettes by

During the odorant response in the cilia of olfactory neurons, the second messenger _______, leads to the opening of ion channels in the plasma membrane of olfactory neurons and the production of a nerve impulse.

The MEK kinase (MAP kinase/ERK kinase) is unusual in that it

Growth factors and cytokines both lead to tyrosine phosphorylation through receptors, but they do so through different mechanisms. What is the key difference between the receptors for these two classes of ligands in terms of their tyrosine kinase activity?

What is the family of receptors for most growth factors?

An Overview of Cells and Cell Research

Molecules and Membranes

Bioenergetics and Metabolism

Fundamentals of Molecular Biology

Genomics, Proteomics, and Systems Biology

Genes and Genomes

Replication, Maintenance, and Rearrangements of Genomic Dna

RNA Synthesis and Processing

Transcriptional Regulation and Epigenetics

Protein Synthesis, Processing, and Regulation

The Nucleus

Protein Sorting and Transport

Mitochondria, Chloroplasts, and Peroxisomes

The Cytoskeleton and Cell Movement

The Plasma Membrane

Cell Walls, the Extracellular Matrix, and Cell Interactions

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters

In unstimulated cells, NF- $\kappa$ B proteins are maintained in an inactive state in the cytosol by interactions with