Hormone X activates the cAMP second messenger system in its target cells. The greatest response by a cell would come from
A) applying a molecule of hormone X to the extracellular fluid surrounding the cell.
B) injecting a molecule of hormone X into the cytoplasm of the cell.
C) applying a molecule of cAMP to the extracellular fluid surrounding the cell.
D) injecting a molecule of cAMP into the cytoplasm of the cell.
E) injecting a molecule of activated, cAMP-dependent protein kinase into the cytoplasm of the cell.
Lymphatic vessels pick up excess tissue fluid, purify it in the lymph nodes, and then return it to t
Female Reproductive System
Schematic of a Ford TFI-IV ignition system. The SPOUT connector is unplugged when ignition timing ...
The thymus, a primary lymphoid organ where T cells mature.
Solar system
Fossil Prokaryotic Cells