![]() In both plant and bacteria cells, the cell wall is the outermost structure of the cell, surrounding the cell, including the cell membrane and in plants, not bacteria, it is made of cellulose. The cell wall is structure found in plant and bacteria cells, but not animal cells. Think of the cell membrane like a gatekeeper controlling the movement of substances into and out of the cell. ![]() It is semi-permeable because some substances such as glucose and water can pass through it, whilst other substances cannot. (right) Gram Stain of Escherichia coli which are Gram-negative (pink) bacilli.The cell membrane is a semi-permeable structure that surrounds a cell and it is present in plant, animal and bacteria cells. (left) Gram Stain of Staphylococcus aureus which are gram-positive (purple) cocci in clusters. Common Gram-positive bacteria of medical importance include Streptococcus pyogenes, Streptococcus pneumoniae, Staphylococcus aureus, Enterococcus faecalis, and Clostridium species. ![]() Gram-positive Bacteria: These retain the initial dye crystal violet during the Gram stain procedure and appear purple when observed through the microscope.Most bacteria can be placed into one of three groups based on their color after specific staining procedures are performed: Gram-positive, Gram-negative, or acid-fast. Gram-Positive, Gram-Negative, and Acid-Fast Bacteria
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