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.
  Proteins are made in the cytoplasm. In prokaryotes, there are proteins called ribosomes that link on to the mRNA and synthesize a protein. This process is called transla â¦ tion.In eukaryotes however, translation also occurs on ribosomes which are situated on the surface of the endoplasmic reticulum.n prokaryotes, there are proteins called ribosomes that link on to the mRNA and synthesize a protein. This process is called transla â¦ tion. In eukaryotes however, translation also occurs on ribosomes which are situated on the surface of the endoplasmic reticulum.