M9 CELL MEMBRANE STRUCTURE AND FUNCTION Flashcards
Between the living machinery of the inner cell and the harsh condition of the outside world stands the cells ___________
Plasma Membrane
as crucial as this barrier is surprisingly __________, push it and watch it move, poke hard enough and it might break and begin to regroup.
Flexible
- The molecules of the membrane naturally assembled in a _______________
Double Layer
- within these living molecules we also find different _______________ which do various things for the cell
Proteins
- because their tails _________________as their heads attracted
Repel Water
- throw in some ________________ and a few carbohydrates and you have the basic structure of a plasma membrane
Cholesterol
- for instance they receive _____________ from the world outside where they transport nutrients and waste
Signals
- so nature composes the membrane with the combination or __________________of different lipids carbohydrates and proteins
Mosiac
- and these molecules are ___________________ and they constantly move within the structure would like changing their positions.
Not Stationary
- The survival of all life rest at this veil of material supple membrane just _____________thick.
Two molecule
Is also known as the plasma membrane
Cell Membrane
Is a thin semi-permeable membrane that surrounds the cytoplasm of a cell.
Cell Membrane
Made up of 2 layers of phospholipids
Lipid Bilayer
- Serves as a barrier that protects the cell from the extracellular environment.
- Maintains balance in the interior of the cell by allowing certain substances into the cell while keeping other substances out.
- For cell-to-cell communication
- For structural support and help maintain its shape.
Cell Membrane
2 parts of Lipid Bilayer
- hydrophilic Head
- Hydrophobic Tails
Makes the cell membrane semi permeable.
Lipid Bilayer
- Dispersed between phospholipids
- Prevents rigidity of cell membrane.
Cholesterol
- Found at the cell membrane surface
- For cell-to-cell recognition.
- Lipid + carbohydrate
Glycolipid
Can be attached to phosphoglyceride lipid (Head) or to integral proteins.
Peripheral Protein
- Move substances in and out of a cell.
- activate other proteins and enzymes.
- Cell-to-cell interaction interactions.
Peripheral Protein
Are permanently embedded within the plasma membrane
Integral Protein
Channel or transport molecules across the membrane.
Integral Protein
2 Types of Integral Protein
- Transmembrane protein
- Monotopic proteins
Act as a cell receptor
Glycoprotein
3 Biomolecules (Macromolecules)
- Lipids
- Proteins
- Carbohydrates
Allow passage of hydrophobic molecules and gases.
O2, CO2, CO, NO, Ethanol and benzene
Do not allow passage of ions and large hydrophilic molecules.
Glucose, amino acids, Na ion, K ion, phosphate, ATP.
