What is a ligand?
a) an integral membrane protien associated with G protiens
b) a DNA-binding protiens that alters gene expression
c) a cytoplasmic second messenger molecule
d) a protien that chemically modifies another protien
e) a signaling molecule that binds to a receptor
What is a ligand?
a) an integral membrane protien associated with G protiens
b) a DNA-binding protiens that alters gene expression
c) a cytoplasmic second messenger molecule
d) a protien that chemically modifies another protien
e) a signaling molecule that binds to a receptor
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Cell biology Questions
1. Where is the sugar-phosphate backbone located in a DNA strand within the DNA double helix?
a) Alternates between outside and inside
b)Inside
c)Outside
d)Varies between purines and pyrimidines
e)Depends on the species
2) Which of these statements defines paracrine cell signaling?
| a) | A messenger molecule released into the blood stream to bind to a receptor on a cell far away from the release site. | ||||||||||||||||
| b) | A messenger molecule released by a cell into the extracellular space that binds to receptors on the surface of the same cell. | ||||||||||||||||
| c) | A messenger molecules released by a cell into the extracellular space that travels short distances to bind to a receptor in a nearby cell. | ||||||||||||||||
| d) | A messenger molecule release by a tissue into the lumen of an organ that diffuse to bind to receptors far away from the release site. | ||||||||||||||||
| e)All of the above. 3. Which effect has the binding of the ligand to a G-protein coupled receptor on intracellular G-protein?
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