Homework Answers
When adrenaline is removed then the GTPase activity of G protein converts GTP into GDP which interrupt signal transduction.Along with it cell also have phosphodiesterase activity which changes CAMP to AMP and addition of phosphate group to alpha subunit of phosphorylase is done by PK A ( protein kinase a).Protein phosphatase get activated which removes the phosphate group from glycogen phosphorylase so the glycogen will not be degraded.
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6. A critical role of all signaling cascades is that they must be turned off rapidly...
Acetylcholine binds to a GPCR on heart muscle, making the heart beat more slowly. The activated r...
Acetylcholine binds to a GPCR on heart muscle, making the heart beat more slowly. The activated receptor stimulates a G protein, which opens a K channel in the plasma membrane, as shown in the figure below. Which of the following would enhance this effect of the acetylcholine? plasma membrane closed K' channel GTP Pr complex activated α subunit K CHANNEL open K'channel OPENING EXTRACELLULAR SPACE CYTOSOL GTP G-PROTEIN INACTIVATION K" CHANNEL CLOSING closed K' channel rt inactive G protein GOP...
Place in the right order the sequence of biochemical events between the release of epinephrine by...
Place in the right order the sequence of biochemical events between the release of epinephrine by the adrenal glands and the breakdown of glycogen in the liver. (1) Epinephrine is released by the adrenal glands. ( ) Activated beta-adrenergic receptors cause GTP for GDP exchange in the alpha subunits of Gs G proteins ( ) The activated catalytic subunits of PKA phosphorylate the inactive phosphorylase kinase b, activating it. ( ) Epinephrine travels in the bloodstream ( ) Two cAMP...
Activity 4. Receptor signaling pathway A model of a G protein receptor signaling pathway is represented...
Activity 4. Receptor signaling pathway A model of a G protein receptor signaling pathway is represented below. Activation of the signaling pathway results in a cell secreting a neurotransmitter through exocytosis. Activated - Activated adenylyl receptor cyclase GTP АТР CAMP Active G protein Protein- kinase A Inactive Active Protein targets Phosphate group A. Different steps in a signaling pathway can amplify the initial signal of one ligand binding to one receptor. Choose one step in the pathway below that results...
open to look at all pictures Multiple Choice Which of the following are true of G...
open to look at all pictures
Multiple Choice Which of the following are true of G protein coupled receptors (GPCRs) A) peripheral membrane protein B) Activates G proteins on cytoplasmic side C) Receptors to lipid soluble hormones D) Binds ligands on cytoplasmic side Submit CASTILLO NAVA Invoice Soon Multiple Choice Which of the following are true of G proteins A) Are integral membrane proteins B) Works with G protein coupled receptors C) dimer D) On the exoplasmic side of membrane...
6. Lipid-soluble signaling molecules, such as testosterone, cross the plasma membranes of all cells A) by...
6. Lipid-soluble signaling molecules, such as testosterone, cross the plasma membranes of all cells A) by diffusion but affect only target cells because only target cells retain the appropriate DNA segments. B) by diffusion but affect only target cells because only target cells have the intracellular receptors for testosterone. C) through hydrophilic channels of transmembrane proteins but affect only target cells because only target cells retain the appropriate DNA segments. D) through hydrophilic channels of transmembrane proteins but affect only...
Epinephrine signaling , like that of insulin, is a multi-step pathway with several amplification steps. Identify...
Epinephrine signaling , like that of insulin, is a multi-step
pathway with several amplification steps. Identify each of the
steps below as either allosteric activation or enzymatic.
Abbreviations: Epi (epinephrine), β2AR
(β2 adrenergic receptor), R2C2
(subunit composition of protein kinase A where R is the regulatory
subunit and C is the catalytic subunit), PDE (cyclic AMP
phosphodiesterase), PPase (phosphoprotein phosphatase).
One of these is wrong but I don't know which one you can only
choose enzymatic or allosteric as the answer...
Question 10-12 10. During the mating process, yeast cells respond to pheromones secreted by other yeast...
Question 10-12
10. During the mating process, yeast cells respond to pheromones secreted by other yeast cells. These pheromones bind GPCRs on the surface of the responding cell and lead to the activation of proteins inside the cell. When a wild-type yeast cell senses the pheromone, its physiology changes in preparation for mating: the cell stops growing until it finds a mating partner. If yeast cells do not undergo the appropriate response after sensing a pheromone, they are considered sterile....
Acetylcholine binds to a GPCR on heart muscle, making the heart beat more slowly. The activated receptor stimulates a G protein, which opens a K channel in the plasma membrane, as shown in the figure below. Which of the following would enhance this effect of the acetylcholine? plasma membrane closed K' channel GTP Pr complex activated α subunit K CHANNEL open K'channel OPENING EXTRACELLULAR SPACE CYTOSOL GTP G-PROTEIN INACTIVATION K" CHANNEL CLOSING closed K' channel rt inactive G protein GOP...
Activity 4. Receptor signaling pathway A model of a G protein receptor signaling pathway is represented below. Activation of the signaling pathway results in a cell secreting a neurotransmitter through exocytosis. Activated - Activated adenylyl receptor cyclase GTP АТР CAMP Active G protein Protein- kinase A Inactive Active Protein targets Phosphate group A. Different steps in a signaling pathway can amplify the initial signal of one ligand binding to one receptor. Choose one step in the pathway below that results...
open to look at all pictures
Multiple Choice Which of the following are true of G protein coupled receptors (GPCRs) A) peripheral membrane protein B) Activates G proteins on cytoplasmic side C) Receptors to lipid soluble hormones D) Binds ligands on cytoplasmic side Submit CASTILLO NAVA Invoice Soon Multiple Choice Which of the following are true of G proteins A) Are integral membrane proteins B) Works with G protein coupled receptors C) dimer D) On the exoplasmic side of membrane...
6. Lipid-soluble signaling molecules, such as testosterone, cross the plasma membranes of all cells A) by diffusion but affect only target cells because only target cells retain the appropriate DNA segments. B) by diffusion but affect only target cells because only target cells have the intracellular receptors for testosterone. C) through hydrophilic channels of transmembrane proteins but affect only target cells because only target cells retain the appropriate DNA segments. D) through hydrophilic channels of transmembrane proteins but affect only...
Epinephrine signaling , like that of insulin, is a multi-step
pathway with several amplification steps. Identify each of the
steps below as either allosteric activation or enzymatic.
Abbreviations: Epi (epinephrine), β2AR
(β2 adrenergic receptor), R2C2
(subunit composition of protein kinase A where R is the regulatory
subunit and C is the catalytic subunit), PDE (cyclic AMP
phosphodiesterase), PPase (phosphoprotein phosphatase).
One of these is wrong but I don't know which one you can only
choose enzymatic or allosteric as the answer...
Question 10-12
10. During the mating process, yeast cells respond to pheromones secreted by other yeast cells. These pheromones bind GPCRs on the surface of the responding cell and lead to the activation of proteins inside the cell. When a wild-type yeast cell senses the pheromone, its physiology changes in preparation for mating: the cell stops growing until it finds a mating partner. If yeast cells do not undergo the appropriate response after sensing a pheromone, they are considered sterile....
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