HW: 12-10 through 12-14 Monday- Check grades; Preview Cell structure by finishing # 7 in DA. Tuesday- Review Cell Vocab/Notes Wednesday- Review Cell Vocab.

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Presentation transcript:

HW: 12-10 through 12-14 Monday- Check grades; Preview Cell structure by finishing # 7 in DA. Tuesday- Review Cell Vocab/Notes Wednesday- Review Cell Vocab. Thursday- Finish in class work if needed. Friday- No homework. Quiz next week.

What is the difference between a scientific theory and a scientific law? What year did scientists start using the term “cells”? (take a guess) What object do you think was the first item that scientists used to see a cell?

Scientific Hypothesis Scientific Theory A summary that represents a hypothesis or group of hypotheses that have been confirmed through repeated experiments A limited prediction of what may happen in an experiment; usually is written as a cause and effect statement Scientific Law Statement of explained principles to which there are no exceptions.

Cell Theory A timeline

1665 Person: Robert Hooke Accomplishment: First person to describe cells Built a microscope and used it to look at cork; Then identified cells in plants and fungi. Did not see animal cells

1673 Person: Anton van Leeuwenhoek Accomplishment: Observed pond scum, “little animals” today known as Protists Observed animal blood and saw differences between animals 1st person to see bacteria and yeast

1838 Person: Matthias Schleiden Accomplishment: Studied plants and concluded that all plant Parts were made of cells

1839 Person: Theodor Schwann Accomplishment: Studied animals and concluded all animals’ tissues were made of cells Using Schleiden’s observations Schwann wrote the 1st two parts to the cell theory.

1858 Person: Rudolf Virchow Accomplishment: Added the third part to the cell theory “Omnis cellula e cellula”

Cell Division (1879) Walther Flemming carefully observes that animal cells divide in stages and calls the process mitosis. Eduard Strasburger independently identifies a similar process of cellular division in plant cells.

Cell Theory All organisms are made of one or more cells. The cell is the basic unit of all living things. All cells come from existing cells.

The modern tenets of the Cell Theory include: 1 The modern tenets of the Cell Theory include: 1. all known living things are made up of cells. 2. the cell is structural & functional unit of all living things. 3. all cells come from pre-existing cells by division. 4. cells contains hereditary information which is passed from cell to cell during cell division. 5. All cells are basically the same in chemical composition. 6. all energy flow (metabolism & biochemistry) of life occurs within cells.