NAME______________________ DATE_________ PERIOD_________
Cell Membrane Coloring Worksheet
Composition of the Cell Membrane
The cell membrane is also called the p______________ membrane.
The cell membrane is primarily made of a d________ l________ of
p____________ molecules which is embedded with a variety of other
molecuels. Phospholipid molecules are composed of t______ smaller
molecules. The head of a phospholipid is made of two molecules: p___________ and a g__________ . The two tails are chains of
f________ a__________ molecules. The phosphate heads are
polar molecules which causes them to be h_______________ which
means water attracting. The fatty acids tails are nonpolar molecules
are water repelling which means they are h_____________.
Sketch and Label
Draw a phospholipid bilayer as it would appear surrounding a cell. Color
the phosphate heads red and the fatty acid tails blue.
PHOSPHOLIPID BILAYER
1
Other molecules that are part of the Cell Membrane
Depending on the particular cell, there are other molecules embedded
in the phospholipid bilayer. Each molecule has a special job. Cholesterol
molecules s____________ the same membrane and make the
membrane more flexible. Some proteins are part of the c_______ and
others h________________________________. Carbohydrates
serve as i_________________ t______. This enables cells to
d_______________________________________. Embedded in
the phospholipid bilayer are p__________ that aid in helping
molecules move through the cell membrane and help cells recognize
each other.
List 4 functions of the cell or plasma membrane:
a.
_________________________________________
b.
_________________________________________
c.
_________________________________________
d.
_________________________________________
An important property of the cell membrane is s____________
p____________. This means __________________________
________________________________________________.
Another term that means the same as selectively permeable is
s__________________. This property enables a cell to maintain
h_________________ even though ______________________
____________________. The method that a molecule uses to cross
the cell membrane depends on 3 things: its s_______, p__________,
and c____________________________________.
(Refer to page 83 to answer the following questions)
Which types of molecules move easily through membrane? _________
Which molecules must be transported by proteins?_______________
Which molecules are moved inside vesicles?____________________
2
Correctly color code each part of the cell membrane.
Letter
Name/Color
__A__ Phospholipid bilayer
(do not color)
__B__ Integral protein (pink)
__F__ Fatty acid tails (blue)
__G__ Phosphate heads (red)
Letter
__H___
__I__
__C__
__E___
Name/Color
Peripheral protein
(yellow)
Cholesterol (orange)
Glycoprotein (green)
Carbohydrate(purple)
Match the cell membrane structure or its function with the correct
letter from the cell membrane diagram.
Letter
_____
_____
_____
Structure/Function
Attracts water
Helps maintain
flexibility of membrane
Involved in cell-to-cell
recognition
Letter
Structure/Function
_____
_____
Repels water
_____
Helps transport some
substances across the
cell membrane
3
Make up the bilayer
4