ap biology bell ringer [3 minutes] mark new vocabulary: k, s, h, or d write a sentence using 1 awl...
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AP Biology
BELL RINGER [3 Minutes]• Mark New Vocabulary: K, S, H, or D
• Write a sentence using 1 AWL Word (Consume, Classify, Concise, or Distinct)
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AP BiologyAP Biology
MYP Biology: The Cell Membrane
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What are the functions of the cell membrane?
The cell membrane controls what goes in and out of the cell and helps the cell to maintain homeostasis. The membrane also helps the cell maintain its shape and protects the cell.
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What are phospholipids?• Phospholipids are molecules with a polar
phosphate ‘head’ and two nonpolar fatty acid tails.
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Why do phospholipid bilayers form?
The polar heads of the phospholipids face outwards to be near polar water molecules (they are hydrophilic). The nonpolar tails of the phospholipids, which do not like to be near water molecules, face within the bilayer (they are hydrophobic).
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AP Biology
Phospholipid bilayer
polarhydrophilic
heads
nonpolarhydrophobic
tails
polarhydrophilic
heads
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Label the cell membrane structure
Protein ReceptorPhospholipids Protein Channel
Cholesterol
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What are the functions of the parts of the cell membrane?
Membrane Part Function
Phospholipids Makes up the basic bilayer structure of the membrane
Cholesterol Within the bilayer; gives structure to fluid membrane
Protein Channel Helps molecules pass through the membrane
Protein Receptor Sends and receives signals to and from other cells
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Why is the cell membrane called a “fluid mosaic?”
The cell membrane is often described as a fluid mosaic since it is made up of many different molecules and it is flexible, not rigid.
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AP Biology
What does it mean that the membrane is selectively-permeable?
The cell membrane being selectively-permeable means that it allows some types of molecules to pass in and out of the cell space, but not others.
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What factors determine how a molecule will cross the membrane?
• Size• Charge / Polarity• Concentration
Small, nonpolar molecules can pass through the membrane without assistance if they are moving from high to low areas of concentration.
All other types of particles need some sort of assistance, such as a protein channel in order to pass across the cell membrane.
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AP Biology
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AP Biology
Any Questions??