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Cell Transport and the Cell Membrane
Homeostasis (pg 175)
Homeostasis is the process by which individual cells as well as organisms
_______________________a stable internal environment despite a ___________________
external environment.
List 4 functions of the cell membrane:
a.
_________________________________________
b.
_________________________________________
c.
_________________________________________
d.
_________________________________________
Lipid Bilayer (pg176)
The cell membrane is made of a “sea” of _____________. The phospholipids have a
hydrophilic (water attracting) __________ and two hydrophobic (water repelling)
____________. The head of a phospholipid is made of a _____________, while the two tails are
____________. Phospholipid cell membrane allows only ___________________ substances to
pass through into or out of the cell. SKETCH AND LABEL a phospholipid coloring the heads
red and the tails blue.
PHOSPHOLIPID (pg176, Figure 2)
Membrane Proteins (pg 176-177)
Embedded in the phospholipid bilayer are _________________ . There are four types,
the one called _______________ help with important biochemical reactions within the cell,
while the ________________ act as identifiers, the _________________ provide the cell with a
sense of its environment, and the ___________________ help with the movement of substances.
Correctly color code and identify the name for each part of the cell membrane.
Letter
_____
_____
_____
Name/Color
Phospholipid bilayer (no color)
Cell Surface markers (pink)
Phosphate heads (yellow)
Letter
_____
_____
_____
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Name/Color
Receptor protein (red)
Enzymes (blue)
Cholesterol (purple)
Match the cell membrane structure or its function with the correct letter from the cell membrane
diagram.
Letter
Structure/Function
Letter
Structure/Function
_____
_____
Attracts water
Helps with biochemical
reactions
Involved in cell-to-cell
recognition
_____
_____
Repels water
Sugars
_____
Enables a cell to sense its
surroundings
_____
Passive Transport (pg 178 – 181)
Define osmosis. _______________________________________________________________
____________________________________________________________________________
In which direction does water move across membranes, up or down the concentration gradient?
________________
Define these 3 terms:
a. isotonic________________________________________________________
b. hypertonic
________________________________________________________
c. 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.
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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 membrane shrinks
_____ solution with a higher solute concentration
Label the tonicity for each solution (isotonic, hypotonic, or hypertonic):
____________
____________
____________
____________
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____________
____________
Active Transport (pg 182 -183)
Active transport requires ____________ to move substances __________________ their
concentration gradient. __________ is the type of energy most often used in active transport.
One type of active transport is called
the ________________________________ pump.
This pump uses _________________ proteins to
move substances _____________ the concentration
gradient. _______________ ions bind to the protein.
The protein changes its ________________ to move
the ions across the cell membrane.
Label and color the carrier proteins red
and the ions green.
Moving a large substance into or out of a cell takes a special process. This process uses
_____________ to transport substances. Moving substances out of a cell is called ____________
while moving substances into a cell is called ___________________.
What type of transport is represented by the picture below? _________________________
In which direction (concentration gradient), is the movement occurring? __________________
Color the internal (inside) environment of the cell yellow. Color and Label the vesicle red and
outline the cell membrane blue.
This is an example of ENDOCYTOSIS / EXOCYSTOSIS. (Circle one)
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