Cell Part Two Flashcards
Plants, algae, fungi, bacteria
Protects, maintains shape
Porous-allows water, CO2, and oxygen in
Several layers
Pectin- gluey substance holds cell together(Orange peel)
Primary cell wall-made of cellulose, fiberous, elastic
Secondary cell wall-made of cellulose, lignin in rigid woody plants
Cell wall
2 flexible layers with protein channels Made of phosphorous and fat Proteins form channels and pumps Carbs form chemical identification receptors Shape, structure In most cell membranes
Lipid bilayer
Mass of solute in a solution
Concentration
Molecules spread from high to low concentration No membrane Concentration gradient moves with Goes till equilibrium Passive transport, no energy Equilibrium in all directions
Diffusion
Concentration of solute is same throughout the solution
Diffusion-all directions
Equilibrium
Diffusion of water molecules across a selectively permeable membrane
Water moves to high solute concentration
Hypo, hyper, or isotonic
Osmosis
Equal solute concentration
Water exchanges evenly like 60% for 60%
Isotonic
High solute concentration in environment compared to cell
Solute is high outside
Water moves out of cell when environ. Is high
Water moves into cell when concentration is high inside the cell
Hypertonic
Low solute concentrations in environment compared to cell
Solute is low outside
Water moves into cell when low solute in environ.
Water moves to environment when low solute in cell
Hypotonic
Moves with concentration gradient Carried by a protein through channel Transports glucose in RBC Fast, specific no energy required Rate depends on amount of protein carriers available
Facilitated diffusion
Goes against concentration gradient Needs energy Two types Membrane pumps Transports large amount of materials
Active transport
Into the cell
Enters by forming folds or pockets around material, forms a vacuole or vehicle
Joins with the cell membrane forcing contents out
Endocytosis
Cell releases a large amount of material
Exocytosis
Cell eating Large particle digestion forms a food vacuole form cytoplasmic extensions Immune system only in humans Surround a large object and digest it White blood cells eat bacteria How amoeba get food
Phagocytosis
Add liquid in tiny pockets then pinches off
Peeing in the pocket
Drinking
Adding liquid molecule by surrounding it
Pinocytosis