Why is the Ras small GTPase so dangerous when it is no longer able to hydrolyze GTP to GDP? O A CTD will build un to toxie coneentrotione within the ooll ond trigger pooretio ooll deoth

Human Physiology: From Cells to Systems (MindTap Course List)
9th Edition
ISBN:9781285866932
Author:Lauralee Sherwood
Publisher:Lauralee Sherwood
Chapter12: Body Defenses
Section: Chapter Questions
Problem 12RE
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Why is the Ras small GTPase so dangerous when it is no longer able to hydrolyze GTP to GDP?
O A. GTP will build up to toxic concentrations within the cell and trigger necrotic cell death.
B. Ras-GTP will persist in the cell and trigger out of control cell proliferation.
C. Phosphodiesterase will be inhibited and prevent PKA activation.
D. Ras will no longer be able to efficiently bind to its downstream effectors in the crowded cytoplasm.
Transcribed Image Text:Why is the Ras small GTPase so dangerous when it is no longer able to hydrolyze GTP to GDP? O A. GTP will build up to toxic concentrations within the cell and trigger necrotic cell death. B. Ras-GTP will persist in the cell and trigger out of control cell proliferation. C. Phosphodiesterase will be inhibited and prevent PKA activation. D. Ras will no longer be able to efficiently bind to its downstream effectors in the crowded cytoplasm.
Protein scaffolds are an important part of intracellular signaling following activation of receptors on the cell membrane. This is
because scaffolds
A. cause conformational changes in G proteins
B. help proteins find each other to transmit signals in the dense cytoplasm
C. initiate positive feedback loops to alter protein levels in the cytoplasm
D. lead to changes in protein synthesis
Transcribed Image Text:Protein scaffolds are an important part of intracellular signaling following activation of receptors on the cell membrane. This is because scaffolds A. cause conformational changes in G proteins B. help proteins find each other to transmit signals in the dense cytoplasm C. initiate positive feedback loops to alter protein levels in the cytoplasm D. lead to changes in protein synthesis
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Step 1

RAS protein 

RAS proteins are small group of GTPase which main function is to transmit signals within the cells. 

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