2. Which of the following is NOT a type of receptor involved in signal transduct
ID: 3167034 • Letter: 2
Question
2. Which of the following is NOT a type of receptor involved in signal transduction? a TKR b photosynthesis c. GPCR d. ion channels e all are receptors. 3. When ligands binds to TRKs, a. PO, units bind to the intracellular portion of the receptor b. the ions flow out of cell. c second messengers are activated. d. the channel opens and ions flow into the cell. e.the hair on the back of your neck will stand up. 4. When ligands binds to ion channel receptors, a PO, units bind to the intracellular portion of the receptor. b. the ions flow out of cell. c. second messengers are activated. d. the channel opens and ions flow into the cell. e. the hair on the back of your neck will stand up. s. When ligands binds to GPCRs a PO, units bind to the intracellular portion of the receptor b. the ions flow out of cell. c. second messengers are activated. d. the channel opens and ions flow into the cell. e. the hair on the back of your neck will stand up.Explanation / Answer
Answer 2 - Photosynthesis is correct answer.
Photosynthesis is a process of preparing food from sunlight by green plants. It is not a signalling process.
Answer 3 - PO4 units binds to intracellular portion of the receptor is correct answer.
TRK is a tyrosine kinase receptor. It is a dimer, both subunits remain separated, when ligand binds to TRK they form dimer and their intracelluar portion gets phosphorylated. Phosphorylation leads to further signalling cascade.
Answer 4
The channel opens and ions flow into the cell, is correct answer
Ion channel are special ion transporters. They are specific to ions to be transported. They remain closed. On ligand binding they get activated and cause ion transport into the cell.
Answer 5
Second messengers are activated is correct answer.
GPCR is a G-protein coupled receptor. Upon ligand binding it activates a second messenger in the cell. In most of the cases that second messenger is cyclic AMP.
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