cell unit cancer cells red blood cells white blood cells development of the cell theory
TRANSCRIPT
CELL UNIT
Cancer Cells
Red Blood Cells
White Blood Cells
Development of the Cell
Theory
The average human being is composed of around 100 Trillion individual cells!!!It would take as many as 50 cells to cover the area of a dot on this letter “i”
CHARACTERISTICS OF LIVING THINGS
Living things are made up of cells. Living things reproduce. Living things are based on a universal genetic
code. Living things grow and develop. Living things obtain and use materials and energy. Living things respond to their environment. Living things maintain a stable internal
environment. Taken as a group, living things change over time.
NATURE OF SCIENCEThe goal of science is to investigate and understand the natural world, to explain events in the natural world, and to use those explanations to make useful predictions.
Scientists build upon the work of other scientists.
DISCOVERY OF THE CELL
Robert Hooke looked at a thin slice of cork under a microscope .
He saw thousands of tiny, empty chambers.
He called his discovery “cells”.
Robert Hooke
1665
DISCOVERY OF THE CELL
Anton van Leeuwenhoek
Observed tiny living organisms in drops of pond water.
I will call them animalcules!
1674
DISCOVERY OF THE CELL
Reported the discovery of the nucleus.
1833Robert Brown
NUCLEUShttp://www.goldiesroom.org/video_archive.htm
DISCOVERY OF THE CELL
Matthias Schleiden
Concluded that all plants are made up of cells.
Elodea Cells
Leaf CellsOnion Cells
1839
DISCOVERY OF THE CELL
Theodor Schwann
Heart Muscle Cells
Neurons
Concluded with Schleiden that all animals are made of cells.
1839
SCHLEIDEN AND SCHWANN’S CELL THEORY
The cell is the unit of structure, physiology, and organization in living things.
The cell retains a dual existence as a distinct entity and a building block in the construction of organisms.
Cells form by free-cell formation, similar to the formation of crystals (spontaneous generation).
The third idea of their cell theory was incorrect!!!
DISCOVERY OF THE CELL
Rudolph Virchow
"Omnis cellula e cellula"...
"All cells only arise from pre-existing cells".
Proposes that all cells come from existing cells.1855
THE MODERN TENETS OF THE CELL THEORY
INCLUDE:
1. All known living things are made up of cells.
THE MODERN TENETS OF THE CELL THEORY
INCLUDE:
2. The cell is structural & functional unit of all living things.
THE MODERN TENETS OF THE CELL THEORY
INCLUDE:
3. All cells come from pre-existing cells by division. (Spontaneous Generation does not occur).
Gravy is boiled. Flask isopen.
Gravy is teeming with microorganisms.
Gravy is boiled. Flask issealed.
Gravy is free of microorganisms.
Section 1-2
Figure 1-10 Spallanzani’s Experiment
THE MODERN TENETS OF THE CELL THEORY INCLUDE:
4. Cells contains hereditary information which is passed from cell to cell during cell division.
THE MODERN TENETS OF THE CELL THEORY
INCLUDE:
5. All cells are basically the same in chemical composition.
THE MODERN TENETS OF THE CELL THEORY
INCLUDE:
6. All energy flow (metabolism & biochemistry) of life occurs within cells.