Area of Study 3 - Plasma Membrane Flashcards
Draw a picture of the Fluid Mosaic Model Include: Hydrophilic + Hydrophobic head Carbohydrate chain Glycolipid Glycoprotein Protein Molecule Cholesterol
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What is the role of Cholesterol in the cell membrane and what would happen without it?
This helps slightly immobilize the outer surface of the membrane and make it less soluble to very small water-soluble molecules that could otherwise pass through more easily. Without cholesterol, cell membranes would be too fluid, not firm enough, and too permeable to some molecules.
What is the role of Glycolipids in the cell membrane?
To maintain stability of the membrane and to facilitate cellular recognition, Found on the membrane of eukaryotic cells (contains a nucleas and membrane bound organelles)
What is the role of a Glycoprotein?
Cell-Cell interactions
What is the role of a Carbohydrate chain in the cell membrane?
Cell recognition
What is the role of the protein channel in the cell membrane?
Channel proteins facilitate the transport of substances across a cell membrane. They do this through the process of either facilitated diffusion or active transport depending on the concentration gradient, or the difference in the concentration of substances inside and outside the cell membrane.
What are the two types of transport through the protein channel?
Define them with reference to concentration gradient
The first type does not require energy to move the substance across the cell membrane. This is called facilitated diffusion. Energy is not required because the particles move along the concentration gradient, or the difference between the high concentration of particles outside the membrane and the low concentration of the particles inside.
The second type of transport needs energy because it runs against the concentration gradient. This process is called active transport.
How do hydrophobic (Polar) molecules cross the cell membrane?
Hydrophobic molecules can diffuse simply through the membrane.
How do hydrophillic (non polar) and ions travel across the cell membrane?
Ions and large polar molecules cannot diffuse across the cell membrane. Integral membrane proteins enable ions and large polar molecules to pass through the membrane by passive or active transport.
