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).
Proteins for use within the eukaryotic cell or intended for organelles such as mitochondria, chloroplasts, and peroxisomes are synthesized by mRNA molecules attached to ribosomes in the cytoplasm. Electron micrograph of rough endoplasmic reticulum courtesy of Dennis Kunkel's Microscopy.) provide a surface area for protein and lipid synthesis; 2) form a pathway for transporting molecules within the cell; and 3) provide a storage area for molecules the cell has synthesized. 1. Rough Endoplasmic Reticulum ER with ribosomes attached is called rough endoplasmic reticulum (see Fig. 31, Fig.