Cells

Front

selectively permeable

Back

A property of cell membranes that allows some substances to pass across it, while others cannot.

Front

diffusion

Back

The process by which molecules move from an area of higher concentration to an area of lower concentration.

Front

osmosis

Back

The diffusion of water molecules across a selectively permeable membrane.

Front

endocytosis

Back

The process by which the cell membrane takes particles into the cell by changing shape and engulfing the particles.

Front

exocytosis

Back

The process by which the vacuole surrounding particles fuses with the cell membrane, forcing the contents out of the cell.

Front

maintain

Back

to allow to continue; to keep at a certain level or in a certain condition.

Front

Organelle

Back

A tiny cell structure that carries out specific functions.

Front

cell wall

Back

A rigid support layer that surrounds plant cells and some other organisms.

Front

cytoplasm

Back

the thick fluid region of a cell located inside the cell membrane and nucleus.

Front

nucleus

Back

In cells, a large oval organelle that contains the cell’s genetic material in the form of DNA and controls many of the cell’s activities.