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Biology
Booklet 1
Cell membrane
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Structure and their functions
Biology > Booklet 1 > Cell membrane
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Cell membrane
a
thin double-layered membrane
enclosing the cell that
controls
which
substances
can
move in
and
out
of it
Fluid mosaic model
Fluid - refers to the
movement
of some of the
phospholipid
and
protein
molecule within the
layers
Mosaic
- made of different
components
e.g
proteins
selectively permeable
some substances can pass through while others cannot
Qualities
thin
- for efficient movement of materials across
Large surface area
- increases the rate of movement of nutrients into wastes
Flexible - allows unicellular organisms to move
Roles of the cell membrane
provide structure
seperates cytoplasm from the external environment
Controls the movement of substances that move in and out of
the
cell
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