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...
Jan 03, 2016
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.
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
A microscope makes small objects look larger
A compound microscope has more than one lens
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
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.