Choosing Bathroom Countertops. Vanity tops must play the dual role of being durable and capable of standing up to water, soap, cosmetics while serving as an ample work surface for morning rush hour in the bathroom. This is no place for delicate, porous (read: easy-to-stain) surfaces.
1 one set for those proteins synthesized by ribosomes that remain suspended in the cytosol, and. 2  a second set for proteins synthesized by ribosomes that are attached to the membranes of the endoplasmic reticulum (ER) forming rough endoplasmic reticulum (RER).
The first step in protein production is the transcription of DNA to mRNA in the nucleus. The next organelles involved are ribosomes. If the protein is not destined to the cell membrane the mRNA is translated on a cytoplasmic free-floating ribosome.