Download Cell Membrane note with diff and osmosis

NAME______________________ DATE_________ PERIOD_________
Cell Membrane (3.3)
Composition of the Cell Membrane & Functions
The cell membrane is also called the _______________
membrane and is made of a double layer of _____________. The
phosphate lipid has three basic parts, the head of a phospholipid is
made of an alcohol (g________) and __________ group, while the
tails are chains of two _______ _____. The phospholipids have a
hydrophilic (water attracting) __________ and two hydrophobic
(water repelling) ____________.
SKETCH AND LABEL a phospholipid coloring the head pink and the tails red.
PHOSPHOLIPID (pg 81)
The polar heads form the ________surface of the cell membrane and
the tail are found ______ the layers of heads like the filling of a
sandwich. This arrangement is known as a lipid bilayer.
Another type of lipid in the cell membrane is chol______________
that makes the membrane stronger. Embedded in the phospholipid
bilayer are __________ that also aid in diffusion and in cell
identification. Proteins called _____________ proteins go all the way
through the bilayer and help _________move across the membrane,
while peripheral proteins are only on one side. Integral proteins are
also called carrier proteins. Some of the membrane proteins have
______________ chains attached and is known as glycoproteins.
Correctly color code and identify the name for each part of the cell
membrane.
Name/Color
A Fatty acid tails (red)
B Phosphate heads (pink)
C Integral protein (yellow)
Name/Color
C Peripheral protein (orange)
D Cholesterol (green)
E Glycoprotein (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
recognition
Letter
Structure/Function
___
___
Repels water
Make up the bilayer
___
Help transport certain
materials across the cell
membrane
The cell membrane is also know as the “Fluid Mosaic Model”—Explain what this
means:
The cell membrane is essential for maintaining the cell's integrity and
plays a critical role in ______________________.
The cell membrane functions both as gateway and barrier -- regulating
the __________________of material between living and non-living
worlds.
Molecules that move freely across membranes are _____ and nonpolar.
This is known as simple ____________ because it does not require
__________ and the water or molecules are moving __________ the
concentration gradient.
Osmosis and Tonicity
Osmosis is the diffusion of_________________.
Osmosis affects the ________________ (swelling) of cells, different
solution can affect the cells internal water amounts
Contractile Vacuoles are found in freshwater microorganisms - they
____________ _____________ excess water
Turgor pressure occurs in __________ _________ as their central
vacuoles fill with water.
In which direction does water move across membranes, up or down the
concentration gradient? ________________
Define these 3 terms:
Isotonic_________________________________
Hypertonic
Hypotonic
_________________________________
_________________________________
_________________________________
_________________________________
_________________________________
_________________________________
_________________________________
_________________________________
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.
Match the description or picture with the osmotic condition:
A. Isotonic
B. Hypertonic
C. Hypotonic
_____
_____
_____
_____
_____
_____
solution with a lower solute concentration
solution in which the solute concentration is the same
condition plant cells require
condition that animal cells require
red blood cell bursts (cytolysis)
plant cell loses turgor pressure (Plasmolysis)
_____ solution with a higher solute concentration
_____ plant cell with good turgor pressure
_____ solution with a high water concentration
Label the tonicity for each solution:
(isotonic, hypotonic, or hypertonic):
______________
____________
_____________
____________
_____________
_____________