For most cells, it is the cell membrane.
Cells have a plasma membrane that is very selectively permeable i.e, will allow entry of substances that are necessary for the cell functioning.
In case of an egg cell, it is surrounded by follicular cells. It provides protection from various acidic conditions.
For a plant cell, the cell wall serves as a barrier.
Epithelial tissue covers the body surface and lines organs. It is made up of closely packed cells that form a protective barrier and helps with functions like absorption, secretion, and sensation.
A mucosal surface is a lining of cells that produces mucus and covers organs and body cavities that are exposed to the external environment, such as the respiratory, digestive, and reproductive tracts. It serves as a protective barrier against pathogens and helps with absorption and secretion of substances.
The structure that forms a protective layer rich in glycoproteins on the surface of cells is the glycocalyx. It helps in cell-to-cell recognition, protection from mechanical stress, and acts as a barrier against pathogens.
The tissue that covers organs is called epithelial tissue. These cells form a protective barrier against infections, regulate the passage of molecules, and provide a smooth surface for organs to function properly. Epithelial tissue can be found lining internal cavities and organs throughout the body.
The epidermal cells of an onion are located on the outermost layer of the onion bulb, forming a protective barrier.
Epithelial tissue covers the body surface and lines organs. It is made up of closely packed cells that form a protective barrier and helps with functions like absorption, secretion, and sensation.
A mucosal surface is a lining of cells that produces mucus and covers organs and body cavities that are exposed to the external environment, such as the respiratory, digestive, and reproductive tracts. It serves as a protective barrier against pathogens and helps with absorption and secretion of substances.
The structure that forms a protective layer rich in glycoproteins on the surface of cells is the glycocalyx. It helps in cell-to-cell recognition, protection from mechanical stress, and acts as a barrier against pathogens.
cell membrane
A cell membrane, or cell wall.
The tissue that covers organs is called epithelial tissue. These cells form a protective barrier against infections, regulate the passage of molecules, and provide a smooth surface for organs to function properly. Epithelial tissue can be found lining internal cavities and organs throughout the body.
The strands of protein are called keratin. As epidermal cells move towards the surface and develop, they fill with keratin, creating a tough and protective barrier on the skin.
The answer is yes. They possess no nucleus and they they have an exterior protective Cell barrier.
Either the cell membrane, or the cell wall. The cell membrane is most common in animals, and protists, whereas some monerans, and most plants and fungi have a cell wall.
it is the outer most layer of the leave and so covers the leave surface except at the stomata
receives materials from the endoplasmic reticulum and send them to other parts of the cells.
The epidermal cells of an onion are located on the outermost layer of the onion bulb, forming a protective barrier.