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,Period
SEcnON
CELL MEMBRANE
3.3
Study Guide
Date
KEY CONCEPT
VOCABULARY
The cell membrane is a barrier that
separates a cell from the external
environment.
cell membrane
selective permeability
phospholipid
receptor
MAIN IDEA:'
fluid mosaic model
Cell membranes are composed of two phospholipid layers.
1. Draw a phospholipid in the box below. Label the three major parts.
2. Which part of a phospholipid is charged, or polar?
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3. Which part of a phospholipid is nonpolar? __
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'----.::._
. 4. What type of molecules interact with water, polar or nonpolar?
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5. Where does a cell membrane come into contact with water?
it:
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6. Wliy do the phospholipids surrounding the cell form a bilayer?
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c:
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-'--_---'-
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s:
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A cell membrane has other types of molecules embedded in the phospholipid bilayer. List a
function of each type of molecule in the table below,
ro
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Molecule
Function
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7. Cholesterol
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.
8. Proteins
9. Carbohydrates
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Cell Structure and Function
Study Guide Book
Study Guide
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