Transcript The Cell Membrane

The Cell Membrane
Cell Membrane Basics
• Function: Controls the passage of materials into
and out of a cell
• Semi-Permeable: only some materials may
enter/exit
• Double layer of phospholipids (bilayer)
Phospholipid Composition
• 3 Parts
Polar Head
• 1) Phosphate Group
• 2) Glycerol
Nonpolar Tails
• 3) Two chains of fatty
acids
• Arrangement:
– Outside: Polar heads
– Inside: Nonpolar Tails
Phospholipid Bilayer
Cell Membrane Contents
1) Cholesterol Molecules: strength
2) Carbohydrates: identification
3) Various Proteins
Membrane Proteins
• Randomly scattered through bilayer
• Various Functions
– Cytoskeleton: internal support
– Protein channels: allow objects to pass
– Enzymes: speed up chemical reactions
– Markers: cell recognition; fight disease
Kobe Kuiz
1)
2)
3)
4)
Name the 3 parts to a phospholipid?
Which part(s) make up the head of a phospholipid?
Which part(s) make up the tails of a phospholipid?
Which part of phospholipid always seems to be in
contact with a watery environment? Why?
5) Draw and label the basic components of the cell
membrane.
6) Which membrane protein supports the cell
membrane?
7) Which membrane protein allows materials to pass
through?