The Characteristics of Life

Without them…you’re nothing but dirt.

Well okay…maybe not even that. Perhaps you’re really just a bunch of cheap chemicals

…..Who knows...

The Characteristics of Life

There are basically 6 things that Scientist define as required for life. 1) Living things are organized.

• All living things are made of cells– The basic unit of structure and function in an organism

• May be Unicellular - Single celled organism.

• May be Multicellular - Organism composed of many cells.

The Characteristics of Life

2) Living things must acquire and use energy.• Ya got’ta eat, or at least soak in the sun.

3) Living things respond to stimuli.• Plants bend toward light.

• Worms recoil from touch.

• Dogs bark when startled.

• You feel unbridled horror at the sight of a science test.

The Characteristics of Life

4) Living things reproduce.• What good is it if you can’t make more?….

5) Living things grow and develop and adapt.• Nothing starts out and adult. Nothing is what it has

always been.– Darwin

6) Maintain internal conditions separated from an outside environment.

• Homeostasis.• Kind of loops back to the first point.

And now!

For something completely different

The Cell Theory

The Modern Cell Theory consists of three statements based on a large body of scientific research. All living things are composed of cells. All cells come from pre-existing cells. The cell is the fundamental unit of structure and

function in living things.

The Cell Theory

The Modern Cell Theory is derived from the work done by Hooke, Leeuwenhoek, Schleiden, Schwan, Virchow and a few others Who are these people?

If you really want to know these people….

I’ve written 5 new DAR’s for these scientist. Hooke, Leeuwenhoek, Schleiden, Schwan,

Virchow

Go ahead….make my day.

But anyway………………….

The Cell Theory

What then new found technology catapulted these scientist into the stratosphere of leading edge science?

– CD

The Microscope!

The Microscope

A microscope makes small objects look larger

A compound microscope has more than one lens

The Microscope!

http://science.howstuffworks.com/light-microscope5.htm

The Microscope!

Important Parts. Objective lens - gathers light from the specimen Eyepiece (ocular lens)- transmits and magnifies

the image from the objective lens to your eye Coarse-focus knob - used to bring the object into

the focal plane of the objective lens Fine-focus knob - used to make fine adjustments

to focus the image

The Microscope!

Determining Total Magnification: Locate the numbers on the eyepiece and the low power objective

Eyepiece magnification x Objective magnification =Total Magnification For high power objective.

Eyepiece magnification x Objective magnification =Total Magnification

The Microscope!

http://science.howstuffworks.com/light-microscope5.htm

The Microscope

A bit of history Robert Hooke in 1663 using a microscope he built

himself was one of the first people to observe cells.• He called them cells because they reminded him of tiny

rooms. Anton van Leeuwenhoek who at about the same

time built his own microscope and was the first to observe “animalcules” meaning “little animals.” in pond water.

The Microscope

1590 First compound

microscope

1660 Hooke’s compound

microscope

1683 Leeuwenhoek’s

microscope 266x

1886 Modern compound

light microscope

1000x

1933 Transmission

Electron microscope 500,000x

1965 Scanning Electron

microscope 150,000x in 3D

1981 Scanning Tunneling

microscope 1,000,000x