Prevent the passage of certain molecules into the cell.
Explanation:
Cell membrane or plasma membrane consists of lipid bilayer in which proteins are embedded. The carbohydrates are present in the plasma membrane in association with lipids and proteins.
The cell membrane acts as the semi-permeable membrane that allows the movement of selected particles into and out of the cell. The molecules may enter through diffusion, osmosis or by active transport depending on the tyep of molecule.
The answer is chemostat as it is the one responsible of
having to produce microbial products in which are being synthesized in log
phase growth and in such it is having to add fresh medium and a culture liquid
that is being left over for nutrients.
