The cell membrane allows only certain things to pass in and out of the cell.
cell membrane
Antibodies
The structure that sticks out from the cell surface and allows it to move is called a flagellum. Flagella are long, whip-like structures that some cells use to propel themselves through their environment.
Cells.
Cells
Flagella are the organelles in cells that are whiplike in structure. They are responsible for providing motility to certain cells, such as sperm cells in animals and algae cells in plants.
Cells are the basic structure of living things, im not so sure about what you mean by basic function.
Cells with a box-like shape are typically cuboidal epithelial cells. These cells are characterized by their cubic form and are commonly found in glandular tissues and in the lining of certain organs, such as the kidneys and ducts of glands. Their structure allows for efficient secretion and absorption functions.
Cells
The round structures on the tentacles of certain animals, such as octopuses and squids, are called suckers. These suckers have a muscular structure that allows them to grip surfaces and prey. In some species, they can also contain sensory cells, enhancing the animal's ability to interact with its environment.
i believe its gap junctions
Cytoplasm holds all the organelles in place.