Inactivation of a cell-surface receptor depends on:
A. the binding affinity of the receptor.
B. the activity of phosphatases in the cytosol.
C. the concentration of ligand surrounding the
cell.
D. both the binding affinity of the receptor and
concentration of ligand surrounding the cell.
D
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Fungi, together with bacteria, are the principal _________ in the biosphere.
Fill in the blank(s) with the appropriate word(s).
Signals from the atrioventricular (AV) node are carried to the bottom of the heart by ____
a. the sinoatrial (SV) node b. Purkinje fibers c. pacemaker cells d. neurogenic cells e. the polarization node
During parturition, mechanical pressure caused by the movement of the fetus through the uterus causes the release of
____ from the ____.
a. HCG; hypothalamus b. oxytocin; posterior pituitary c. oxytocin; hypothalamus d. HCG; posterior pituitary e. oxytocin; adrenal cortex
Individual initially encounters an immunogen
A. Primary Response B. IgM C. Secondary Response D. IgG E. Latent Period F. 1st Exposure G. 2nd Exposure