On the first day of class we looked at the criteria of living things and we began to go over the Cell Structures You will get an online quiz on wherever we get to by Thursday
THERE ARE TWO TYPES OF TRANSPORT IN A CELL
ACTIVE TRANSPORT
-anything that requires ATP is active transport
-endocytosis, which includes :
1. Phagocytosis - a cell engulfs a smaller item using pseudopods
2. pinocytosis
3. receptor mediated endocytosis
Any movement of molecules AGAINST THE CONCENTRATION GRADIENT is
active transport. Carrier proteins are often used for Na+, Cl+
PASSIVE TRANSPORT
moves molecules across the plasma membrane (aka the cell membrane) ALONG
the concentration gradient.
EXAMPLES:
SIMPLE DIFFUSION - small nonpolar molecules, including O2 and CO2
FACILITATED DIFFUSION - LARGER molecules like glucose, starch, water
facilitated diffusion uses channel proteins , can sometimes use carrier proteins
OSMOSIS
the diffusion of water
When an animal cell is in a hypotonic solution, it fills with water and bursts (lysis).
A plant cell is prevented from bursting by the cell wall. A plant cell merely experiences
TURGOR PRESSURE
