Cell Membrane
Flatworms are animals, animal cells do not have cell walls!Only bacteria, plants, and some fungi have cell walls around their cells.
The cell walls of fungi are composed of a tough substance called chitin
The substance that of eubacterial cell walls is a polymeric substance formed from a polysaccharide backbone tied together by short polypeptides; this primary structuraal molecule of the bacterial cell walls is known as peptidoglycan. Peoptidoglycan varies in chemical structure among different bacterial species.
Fungal cell walls are made of chitin the same substance that insect and crustacean exoskeleton are made of. Chitin is a polysaccharide a long chain of sugar molecules.
material found in the cell walls of all fungi
cellulose
Cytosol is a soluble part of cytoplasm. It forms the ground substance or 'background material' of the cytoplasm. It is located between the cell organelles.
The Cell Membrane forms the outside boundary that separates the cell from its environment.
Silicon dioxide forms the cell walls of diatoms, which are a type of algae with intricate and intricate silica-based cell walls.
The genitalia.
cell membrane
peptidoglycan. This substance provides structural support and protection to the bacterial cell by forming a mesh-like network around the cell membrane. Peptidoglycan is a key component of bacterial cell walls and is absent in the cell walls of other organisms, such as plants and animals.