Download Biology Notes: Cell Membrane

Name: _________________________________________________ Date: _______________ Period: ________ Biology Notes: Cell Membrane Directions: Fill out as we cover the following topics in class. Corresponds to pages 81 ‐ 84 in your text. Cell Membrane Basics • Function: __________________ the _____________________ of materials ______ and ______ of a cell •
___________ layer of phospholipids (_____________) • Semi‐Permeable: only _________________ materials may enter/exit Phospholipid Composition • 3 Parts •
•
_______________ Head •
1) Phosphate Group •
2) Glycerol _______________ Tails –
3) _______chains of ________________________ •
Arrangement: –
________________: Polar heads (__________________________) –
________________: Nonpolar Tails (__________________________) - What causes this arrangement? __________________________ Cell Membrane Contents 1) Cholesterol: __________________ & __________________ 2) Carbohydrates: ____________________________________ 3) Various Proteins Membrane Proteins • Randomly ___________________ through bilayer •
Various Functions - Cytoskeleton: __________________ ______________________ - Protein channels: allow objects to __________________ - Enzymes: _________________ ________ chemical reactions - Markers (carbohydrate chains): cell ____________________; ________________ _________________ Additional Info:
Receptor Proteins • Help cells _______________________ Additional Info: - Maintain ____________________ •
Binds to ________________________ (molecules) - Ex: ____________________ and neurotransmitters •
Two kinds –
_____________________________ –
_____________________________ Review 1) Draw and label the basic components of the cell membrane. 2) Name the 3 parts to a phospholipid? 3) Which part(s) make up the head of a phospholipid? 4) Which part(s) make up the tails of a phospholipid? 5) Which part of phospholipid always seems to be in contact with a watery environment? Why? 6) Which membrane protein supports the cell membrane? 7) Which membrane protein allows materials to pass through? 8) What qualities/characteristics of a cell membrane help the cell to maintain homeostasis?