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SECTION
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CELL MEMBRANE
Study Guide
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KEY CONCEPT
VOCABULARY
The cell membrane is a barrier that
separates a cell from the external
environment.
cell membrane
selective permea bility
phospholipid
receptor
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MAIN IDEA: Cell membranes are composed of two phospholipid layers.
1. Draw a phospholipid in the box below. Label the three major parts.
Phosphate group;
glycerol;
fatty acid
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Which part of a phospholipid is charged or polar? the charqed
3.
V/hich part of a phospholipid is nonpolar? the fattv acid tails
4.
What type of molecules interact with water, polar or nonpolar?
5.
Where does a cell membrane come into contact with water?
6.
Why do rhe phospholipids surrounding the cell form
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phosphate and qlycerol
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polar
outside the cell
bilayer? the polar headsinteract with water
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A cell membrane has other types of molecules embedded in the phospholipid bilayer, List
function of each type of molecule in the table below
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Molecule
Function
7. Cholesterol
strengthen the cell membrane
8.
Proteins
nerp malenars cross rne memprane, pan oT cyrosKerelon
9.
Carbohydrates
Unit 2 Besource Book
McDougal Littell Biology
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STUDY GUIDE, CONTINUED
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1O. In what way is a membrane fluid?
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11. Draw a picture in the box below to represent selective permeability
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Refer to figure 3.18 for visual awnser
MAIN !DEA: Chemical signals are transmitted
across the cell membrane.
12. A receptor
detects a signal molecule and carries out an action in response.
f3. A
is a molecule that acts as a signal when it binds to a receptor.
ligand
14. A ligand
that can cross the cell membrane can bind to an
intracellular
receptor
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15. A ligand
a
that cannot cross the cell membrane can send a message to a cell by binding to
membrane
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receptor, which then
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Vocabulary Gheck
16. What is the fluid mosaic model?
the fluid mosaic model is a description of the arrangement of the molecules that make up a cell mem
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17. The cell membrane allows some, but not all, molecules to cross. What term describes
this property?
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selective permeability
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McDougal Lìttell Biology