1.1 Notes The Cell is the Basic Unit of Life Chapter 1 1.1 Notes The Cell is the Basic Unit of Life

Prokaryotic VS. Eukaryotic Prokaryotic/Unicellular – made up of only one cell Ex. Stentor Eukaryotic/Multicellular – made up of two or more cells Ex. Humans Eukaryotic - Has all the organelles Both unicellular and multicellular living things are called organisms Stentor

1.1 Observing Living Things Living things all: Respond to their environment Need energy Grow Reproduce Get rid of wastes Living things are in every environment on earth Largest living organism = honey mushroom 890 hectares Strongest living organism = rhinoceros beetle 850x Fastest living organism = cheetah 100km/hr

The Microscope Use microscope to look at small organisms Types of microscopes – magnifying glass, compound microscope, electron microscopes, and scanning electron microscopes Electron microscopes produce pictures called electron micrographs Anton Van Leeuwenhoek = first person to build a microscope

The Compound Microscope Eyepiece Ocular Lens Used for viewing and contains a lens that magnifies(10X) Arm Supports the eyepiece and objective lenses Coarse Focus Knob Focus at LOW power ONLY Fine Focus Knob Focus at MEDIUM or HIGH Power Objective Lenses Magnify the image (3-4) Revolving Nosepiece Holds the three objective lenses Stage Supports the slide (stage clips to hold slide) Light Source Supplies the light needed to view the slide Base Supports the entire microscope Iris Diaphragm Controls the amount of light that enters

The Compound Microscope

Magnification of Compound Microscopes When you look through a compound microscope the image you see will be: Magnified – Inverted – Reversed   Magnification of Compound Microscopes Low power = 4x Medium power = 10x High power = 40x Eyepiece = 10x Total Magnification = objective lens x eyepiece Low power= Ex. 4x10 = 40X Medium power = ________________________ High power = ___________________________ Letter e under a microscope

How Close Can We Go? Resolving Power =the ability to distinguish between two dots or objects that are very close together   The microscope extends the human eyesight allowing us to see things that are closer together. (.2um for the compound microscope)

What Some Real Cells Look Like…

Your Turn! Page 20 - Look at the prefixes and know how to use them Reading Check Page 15 – Questions 1-5 Page 21 – Questions 5-8

What You Need for Your Labs How to Label Microscope Diagrams 1. Always draw diagrams in pencil 2. Keep diagrams fairly large 3. Name the diagram or object 4. Label the diagram 5. State the magnification, if using a microscope 6. Include any important notes about the diagram, such as the stain used