Looking at CellsLooking at Cells

What is the Metric What is the Metric System?System?

Metric SystemMetric SystemExamine the SI units in Table

1(page 50). How many meters are there in a kilometer? How many centimeters are in a meter?

OpenerOpenerWhat is ONE major benefit to the

metric system?

How does the metric system work?

How have microscopes benefitted you???

Metric SystemMetric SystemThe Metric System is the

International System of measurement.

It is based on powers of 10.

Why might it be important to have a universal system of measurement?◦Scientist need to have a “common

ground” for performing experiments.

Microscope VideoMicroscope Videohttp://www.archives.nbclearn.co

m/portal/site/k-12/browse?cuecard=40197

MicroscopesMicroscopesLightLight Electron Electron

Light MicroscopeLight Microscope

Light microscopes have 2 lenses and a source of light.

Objective Lens & Ocular Lens

Each lens has its own MAGNIFICATION.◦ You multiply each lens’s

magnification to get the total magnification

◦ 10x times 40x = 400x

Electron MicroscopeElectron MicroscopeElectrons are

shot at the object.

Electrons then bounce off, or pass through the object to create an image.

Can magnify up to 200,000 times.

In your book on page __In your book on page __Transmission

Electron Microscope

Scanning Electron Microscope

Cell FeaturesCell Features

Cell TheoryCell Theory Three Parts

1.All living things are made of one or more cells

2.Cells are the basic units of structure and function in the organisms

3.All cells arise from existing cells.

PROPROkaryotes vs. karyotes vs. EUEUkaryoteskaryotes

Observe the three cells:◦Cite 3 differences between the cells◦Think organelles!

PROPROkaryotes & karyotes & EUEUkaryoteskaryotes

Prokaryotes◦ Single Celled

Organisms◦ NO true nucleus◦ Prokaryotes have

little internal structure

Eukaryotes◦ Single celled or

Multi-cellular organisms.

◦ HAVE true nucleus◦ Have ORGANELLES

Left SideLeft SideDescribe Similarities and

Differences in Light and Electron Microscopes

Similarities◦ ◦ ◦

•Differences• • •

Cell MembranesCell Membranes

The Cell encloses the cell and holds in the CYTOPLASM.

The Cell membrane is a PHSOPHOLIPID BI-Layer

The cell membrane regulates what enters the cell

Opener 2/2/2012Opener 2/2/2012One day you found out that there

was a great need for shoes in the world. You decided you wanted to open a shoe factory. What would need to do this???

◦BE DESCRIPTIVE! You need a list of at least 8 components!

Opener Page ____Opener Page ____Develop an analogy for an ANIMAL

cell.◦You must include:

Cell Membrane Nucleus Nucleolus Mitochondria Golgi Body Ribosome Endoplasmic Reticulum (Smooth & Rough can be

1) Cytoplasm Lysosomes

Cell OrganellesCell Organelleshttp://www.cellsalive.com/