The cell and OsmosisLab #4

Prof. SantosLaGuardia Community College

The cell

• Basic unit of life• All living things are made up of cells• All cells come from previous cells• Cells are the basic structural and functional units of life!

Differences between plant and animal cell• 1- shape• 2- presence of chloroplast• 3- central vacuole• 4- presence of cell wall• 5- presence of centrioles

2 types of cells

• Eukaryote and prokaryote

Aim: Lab #4 assignments

• Assignment• Make a wet mount of an onion epidermal section and stain with

Iodine. Look under low and high power. • Complete item 3 on lab report 3 on page.

• Assignment• Make a wet mount of your cheek cells and stain with methylene blue!• Look under both low and high power.• Complete item 5 on lab report 3.

Movement of materials across membrane1- passive transport- movement of materials from high to low concentration2- active transport- movement of materials from low to high concentration3- diffusion- movement of small molecules from high to low concentration

Osmosis

• The movement of water from a region of high concentration to low concentration.

Comparing hypo, hyper and isotonic solutions1- hypertonic - more solute2- hypotonic – less solute3- isotonic- - equal amounts of solute