#Question id: 1225
#Unit 4. Cell Communication and Cell Signaling
The dissociation constant Kd for a receptor-ligand complex is
a. a measure of the affinity of the receptor for the ligand.
b. the concentration of the ligand at which half of the receptors contain bound ligand.
c. a measure of the time it takes for a ligand to be converted to a product.
d. equal to koff/kon
#Question id: 4963
#Unit 11. Evolution and Behavior
Which free-living cells were the earliest contributors to the formation of Earthʹs oxidizing atmosphere?
#Question id: 6635
#General Aptitude
Choose the group of letters which is different from others.
#Question id: 11906
#Unit 7. System Physiology – Animal
Which of the following changes would you expect to find after administering a vasodilator drug that caused a 50% decrease in afferent arteriolar resistance and no change in arterial pressure?
#Question id: 1059
#Unit 4. Cell Communication and Cell Signaling
A limiting factor for viral infection is