Unit 2 - Cells Flashcards
All other forms of life - have a membrane bound nucleus
Eukaryotic Cell
Bacteria/ archea
Prokaryotic Cell
Phospholipids from a two-layer sheet in the membrane
Phospholipid Bilayer
Face outward and are exposed to water
Hydrophilic heads
Face inward and are shielded from water
Hydrophobic Head
Proteins embedded in the phospholipids and can drift about in the phospholipids
Fluid Mosaic (Membranes)
Attach the extracellular matrix on the outside of the cell as well as span the membrane to attach to the cytoskeleton
Integrins
Cross membrane easily (I.e. CO2 and O2)
Nonpolar molecules
Do not cross membrane easily (i.e. Glucose and other sugars)
Polar molecules
A process in which particles spread out evenly in available space
Move from high to low concentrations, eventually particles reach equilibrium
Diffusion
Diffusion across a cell membrane and does not require energy
Passive Transport
Water moves across a membrane in response to a solute concentration inside and outside of the cell by a process called
Osmosis
Osmosis will move across a membrane down its [blank] until the concentration of solute is equal on both sides of the membrane
Concentration Gradient
Describes the ability of a solution to cause the cell to gain or lose water
Tonicity
Concentration of solute is same on both sides, equilibrium
Isotonic