How does insulin inactivate glycogen synthase kinase?
By activating a kinase that phosphorylates the active form of glycogen synthase kinase, thereby inactivating it.
Insulin is a kinase -- an enzyme that phosphorylates various proteins -- and among the proteins it phosphorylates is glycogen synthase.
Insulin enters sensitive cells (cells having the insulin receptor) and binds to glycogen synthase, inactivating it.
All of the above.
How does insulin inactivate glycogen synthase kinase? By activating a kinase that phosphorylates the active form...
1. How does the injection of insulin affect the signal transduction pathway of type 1 diabetics? a. Injected insulin prevents the glucose from binding to cellular protein receptor. b. Insulin acts as a secondary messenger that cascades the message to allow glucose into the cell. c. Insulin is absorbed into the cytoplasm and binds with the transcription factor to make it active. d. Protein receptors on the cell bond to the insulin, which allows glucose to enter...
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...
1. You are interested in how
cyclic-AMP-dependent protein kinase A (PKA) functions to affect
learning and memory, and you decide to study its function in the
brain. It is known that, in the cells you are studying, PKA works
via a signal transduction pathway like the one depicted in Figure
16-15. Furthermore, it is also known that activated PKA
phosphorylates the transcriptional regulator called Nerd that then
activates transcription of the gene Brainy. Which, if any
of the situations described...
1. In allosteric enzyme inhibition, the active site is blocked by another molecule a. True b. False 2. In the second-messenger system of hormonal action, a. The presence of a small amount of one hormone (the second messenger) is essential to permit another hormone (the first messenger) to exert its full effect. b. A tropic hormone (the first messenger) stimulates secretion of another hormone (the second messenger). c. The hormone first binds to a specific surface receptor (the first messenger),...
. Gleevec (Imatinib) inhibits protein kinase BCR-ABL, which is
constitutively active in patients with Chronic Myelogenous Leukemia
(CML). The structure of Gleevec is shown below:
a) Based on our discussion in lecture and the structure above,
explain how the “lead” compound structure for Gleevec was designed
and how it led to the development a compound that could bind ABL
with higher affinity than ATP.
b) Using a broad kinase inhibition assay, you discover that
Gleevec inhibits another tyrosine kinase called...
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....
3. A phosphate group binds to a portion of an enzyme far removed from the active site. This is likely to result in A. competitive inhibition B. competitive activation C. allosteric inhibition D. allosteric activation E. could be C or D 4. How to an aldose and a ketose differ? A. an aldose has fewer carbons than a ketose B. an aldose is a carbohydrate and a ketose is a lipid C. an aldose has catalytic capability and a ketose...
Name 2ors L! You are inte finding protein are interested in understanding how Top5 expression is regulated. Top5 is a microtubule protein. You study a cell line where Top5 expression is controlled by a signal, Ligl. When hinds to and activates the membrane bound recentor it activates the Ras protein, which activates atein kinase called PKF, which then phosphorylates Grp4 on T224. Grp4 is a gene regulatory Wotein that can only enter the nucleus when phosphorylated: Thos is not expressed...
Yet, all the cells in your body contain the same
genes (and same alleles). The difference across cell types
is that genes get selectively expressed (turned on or off)
based on the proteins needed for cellular function given their
environment.
Select which statement explains the reason why hair does not
normally grow on your muscle cells.
a.
Muscle cells have the gene for keratin, but do not express
it
b.
Muscle cells do not have the gene for keratin and...
During the aerobic metabolism of glucose, glucose is ____________. Reduced to form water Oxidized to form water Reduced to form CO2 Oxidized to form CO2 Which of the following describes the equation: FAD + XH2 à FADH2 + X. FAD is reduced to FADH2 It is a coupled reduction – oxidation reaction XH2 is oxidized to X All of the above Which of the following is FALSE about glycolysis? The initial steps of glycolysis requires energy derived from the splitting...