CSST Exam Questions With Correct
Answers A+
What is a ligand? - Answera molecule that binds to a receptor
What is autocrine signaling? - AnswerWhen a cell produces a signalling molecule that acts on
the cell itself
What is paracrine signaling? - Answercell signals nearby cell
What is endocrin...
What is a ligand? - Answer✔a molecule that binds to a receptor
What is autocrine signaling? - Answer✔When a cell produces a signalling molecule that acts on
the cell itself
What is paracrine signaling? - Answer✔cell signals nearby cell
What is endocrine signaling? - Answer✔signal molecule travels to a distant cell/organ
What type of molecule bind at plasma membrane receptors?
Name an example - Answer✔small charged molecules
Insulin, glucagon etc...
What binds to intracellular receptors? - Answer✔usually transcription factors
Should the Kd value be higher or lower than the Basel level of the ligand - Answer✔higher
True or false:
50% of the receptors need to be bound to produce a response - Answer✔false
Is the level of signalling molecules in the blood higher or lower than the Kd value -
Answer✔lower
If you have more receptors than the signalling molecules do you need more or less signalling to
activate - Answer✔less
define an orphan G protein - Answer✔its signalling molecule is unknown
True or false:
GTP binds more than GDP as GTP is 10x more abundant - Answer✔true
What G protein subunits are tethered to the membrane - Answer✔beta and gamma
How many membrane spanning domains do G protein coupled receptors have - Answer✔7
What is the Role of G alpha S - Answer✔stimulatory
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