NAME_____KEY________ DATE_________ PERIOD_________
Cell Membrane Coloring Worksheet
Composition of the Cell Membrane & Functions
The cell membrane is also called the ____PLASMA_____ membrane
and is made of a phospholipid ____BILAYER___. The phospholipids have
a hydrophilic (water attracting) ___HEAD_ and two hydrophobic (water
repelling) __TAILS__. The head of a phospholipid is made of an alcohol
and _____P___ group, while the tails are chains of _____FAs_____.
Phospholipids can move ___FREELY___ and allow water and other
_SMALL_ molecules to pass through into or out of the cell. This is known
as simple _DIFFUSION_ because it does not require _ENERGY_ and the
water or molecules are moving ___DOWN_ the concentration gradient.
SKETCH AND LABEL a phospholipid coloring the heads red and the tails
blue.
PHOSPHOLIPID
Another type of lipid in the cell membrane is _CHOLESTERAL__
that makes the membrane more fluid. Embedded in the phospholipid
bilayer are _PROTEINS_ that also aid in diffusion and in cell recognition.
Proteins called _INTEGRAL_ proteins go all the way through the bilayer,
while _PERIPHERAL_ proteins are only on one side. Integral proteins are
also called _CHANNEL_ proteins. Large molecules like _LIPIDS_ or
carbohydrates use proteins to help move across cell membranes. Some of
the membrane proteins have carbohydrate _RECEPTORS_ attached to
help cells in recognize each other and certain molecules.
List 4 functions of the cell or plasma membrane:
a.
_Cell membranes help organisms maintain homeostasis by
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b.
c.
d.
controlling what substances may enter or leave cells_
_exchange materials such as food, water, & wastes with
its environment_
_water, oxygen, & carbon dioxide can move in and out
freely__
_is semi-permeable or selectively permeable only allowing
certain molecules to pass through__
Correctly color code and identify the name for each part of the cell
membrane.
Letter
Name/Color
__A___ Phospholipid bilayer (no
color)
__B___ Integral protein (pink)
__AB__ Fatty acid tails
(orange)
_AD__ Phosphate heads
(yellow)
Letter
__C__
__AC__
__D__
Name/Color
Peripheral protein
(red)
Cholesterol (blue)
Glycoprotein (green)
__E__
Glycolipids (purple)
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AB
D
AC
AD
Match the cell membrane structure or its function with the correct
letter from the cell membrane diagram.
Letter
Structure/Function
Letter
Structure/Function
__AD__ Attracts water
Helps maintain
__AC_
__AB__ Repels water
Make up the bilayer
__A_
__C_
__B__
flexibility of membrane
Involved in cell-to-cell
recognition
Help transport certain
materials across the cell
membrane
Osmosis and Tonicity
Define osmosis. _MOVEMENT OF WATER DOWN CONCENTRATION
GRADIENT_
In which direction does water move across membranes, up or down the
concentration gradient? _____DOWN______
Define these 3 terms:
a. isotonic___CELL IS EQUILIBRIUM___
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b. hypertonic
c. hypotonic
__CELL IS IN SOLUTION THAT HAS A LOWER
CONC OF WATER, CAUSING CELL TO
SHRINK_______
_CELL IS IN SOLUTION THAT HAS A HIGHER
CONC OF WATER, CAUSING THE CELL TO
SWELL_
Use arrows to show the direction of water movement into or out of
each cell. Color and label the cell in an isotonic environment light blue,
the hypotonic environment yellow, and the hypertonic environment light
green.
HYPERTONIC
ISOTONIC
HYPOTONIC
Match the description or picture with the osmotic condition:
A. Isotonic
___C__ solution with a lower solute concentration
___A__ solution in which the solute concentration is the same
B. Hypertonic
___C__ condition plant cells require
___A__ condition that animal cells require
C. Hypotonic
___C__ red blood cell bursts (cytolysis)
___B__ plant cell loses turgor pressure (Plasmolysis)
___B__ solution with a higher solute concentration
___C__ plant cell with good turgor pressure
___C__ solution with a high water concentration
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Label the tonicity for each solution (isotonic, hypotonic, or
hypertonic):
_____HYPO_____
____ISO____
__HYPER____
__HYPO____
__HYPO____
__HYPER____
Transport Requiring Energy
What type of transport is represented by the following picture?
___ACTIVE________
What energy is being used? __ATP_______
In which direction (concentration gradient), is the movement occurring?
____AGAINST(UP)______
Color the internal environment of the cell yellow. Color and Label the
transport proteins red and the substance being moved blue.
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One type of active transport is called the __Na/K__ pump which helps
muscle cells contract. This pump uses __ENERGY__ to move ions _UP__
the concentration gradient. The protein that is used to pump the ions
through is called a __CARRIER__ protein and it changes its
__SHAPE___ to move the ions across the cell membrane. Label and
color the carrier proteins red and the ions green.
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