Viral infections are common in babies and children and often cause a minor rash of the skin. These rashes are usually harmless and will go away on their own. Different viruses can cause different rashes, and sometimes different viruses can cause rashes that look the same.
receptors for both lipid-soluble and lipid-insoluble hormones are found within the cell and usually within the nucleus. receptors for lipid-soluble hormones are on or in the cell membrane, whereas receptors for lipid-insoluble hormones are inside the cell.
Water-soluble hormones: -do NOT pass readily through the lipid-rich plasma membrane that surrounds the target cell. -Instead, they bind with receptors on the surface of the target cell. -The receptors are glycoprotein complexes. Process of water-soluble hormones: -The receptors have a binding domain that projects beyond the outside of the plasma membrane and a catalytic domain that projects into the cytoplasm of the cell. -Directly or indirectly, most receptors initiate cellular responses by activating protein kinases, which catalyze the transfer of phosphate groups from ATP to specific proteins.