National 5 Cell structure The functions of cell organelles Cells are microscopic building blocks of unicellular and multicellular living organisms.

There are many different kinds of membranes in a cell. Learn how they subdivide sections of a cell and how proteins in these membranes are gatekeepers for what goes in and what comes out.

Plant cells have some specialized properties that make them distinct from animal cells. Learn how special structures, such as chloroplasts and cell walls, create this distinction.

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