Anyone can get melasma, but it is more common among young women. Melasma often appears during pregnancy, in the second or third trimesters. Doctors don't know exactly what causes melasma, but the condition is associated with the female hormones estrogen and progesterone.
A ribosome is made of numerous proteins and RNA. Function The Golgi complex takes proteins made by the endoplasmic reticulum and exports them out of the cell as needed. It is able to keep dangerous proteins from damaging the cell which made them. It is like a packaging department ready to deliver the protein products made in the cell.
A gene tells a cell how to make a specific protein. Proteins are used by the cell to perform certain functions, to grow, and to survive. Shape of the DNA Molecule. Although DNA looks like very thin long strings under a microscope, it turns out that DNA has a specific shape.