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“cells”. - Biggs` Biology
“cells”. - Biggs` Biology

... • A high ratio of surface area to volume is important for cells – Exchange of material with surroundings is easier with a large surface area and smaller volume. – Elephants don’t have larger cells they have more cells. ...
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... ribosomes attached to its outer surface. Newly made proteins enter the RER lumen where they are chemically modified and tagged for delivery to specific locations. The proteins are transported in vesicles that pinch off from the ER. All secreted proteins and most membrane proteins pass through the RE ...
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Cell membrane



The cell membrane (also known as the plasma membrane or cytoplasmic membrane) is a biological membrane that separates the interior of all cells from the outside environment. The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells. The basic function of the cell membrane is to protect the cell from its surroundings. It consists of the phospholipid bilayer with embedded proteins. Cell membranes are involved in a variety of cellular processes such as cell adhesion, ion conductivity and cell signalling and serve as the attachment surface for several extracellular structures, including the cell wall, glycocalyx, and intracellular cytoskeleton. Cell membranes can be artificially reassembled.
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