Exam 15: Cell Signaling and Signal Transduction: Communication Between Cells

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What is the reason for the withdrawal of cells from the cell cycle after exposure to stressful stimuli,like X-rays and damaging chemicals?

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Why does rhodopsin have an unusually stable structure for a GPCR?

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What event is usually responsible for terminating signal transduction by RTKs?

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At which site do virtually all of the signals that regulate the activities in which a cell is engaged originate?

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What enzyme below does diacylglycerol (DAG)recruit and activate?

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Why are G-protein coupled receptors often known as 7TM receptors?

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________ form a small group of proteins that bind to GPCRs and compete for binding to those GPCRs with heterotrimeric G proteins.

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The _________ pathway of apoptosis is one in which internal stimuli activate apoptosis.

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Which of the following are not natural ligands that bind to G-protein coupled receptors?

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How does the immune system manage to avoid recognizing and attacking normal cells within the body?

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What gene in C.elegans was found to play a critical role in apoptosis?

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Specificity in MAP kinase pathways is sometimes achieved by spatial localization of the pathway's component proteins.Spatial localization of these components is done by structural (i.e. ,nonenzymatic)proteins called _____________.

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What inorganic gas has been shown to act as a second messenger that relaxes the smooth muscles of blood vessels?

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Which statement below is an accurate description of receptor-mediated dimerization?

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In which of the following biological processes is nitric oxide not involved?

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How is Ras activity turned off?

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For many years,_______ was the only member of the GPCR superfamily to have its X-ray crystal structure determined.

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Which hormone is secreted by α\alpha -cells in the pancreas in response to low blood glucose levels?

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What part of an insulin-receptor substrate binds to tyrosine phosphorylation sites on the activated insulin receptor?

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G α\alpha -subunit with its attached GTP activates an effector like adenylyl cyclase.

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