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Life and Cells

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by

Jaime Richards

on 27 March 2014

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Transcript of Life and Cells

Life and Cells
Objectives
1. Characteristics of Life
2. Discovery of Cells & Cell Theory
3. Structure and Function of Cells
4. Cell Transport and Diffusion

Characteristics of Life
All living things...

Cell Theory
Organelles
Organelles are specialized structures that perform distinct processes within the cell
Detail 4
Pre-Test
True or False
1. Nothing can enter or exit a cell.
2. Plant and animal cells are identical.
3. The nucleus contains DNA.
4. All cells contain Ribosomes.
5. Mitochondria create Energy for the cell.
6. It is impossible to look at a cell without
a microscope.
Grow
& Develop
Reproduce
Adaptation
Winter
Summer
Made of Cells
Require Energy
Respond to Environment
If cells cannot typically be seen by the naked eye, how were they discovered?
Former Historical Ideas in Biology
The Slow Death of Spontaneous Generation
http://dotsub.com/user/vallisso

In 1838 German scientist
Matthias Schleiden
studied plant tissues
and proposed that all plants were made of cells.

In 1839, another German scientist,
Theodor Schwann concluded that all animals are made
of cells.

In 1855
Rudolf Vichow proposed that all cells come from cells.
Together these ideas make
cell theory.

Timeline of Microbiology
1600
1644 Jan Baptist Van Helmont
1655 Robert Hooke
1668 Francesco Redi
1674 Van Leeuwenhoek
1745 John Needham
1768 Lazzaro Spallanzani
1774 Edward Jenner
1859 Louis Pasteur
1928 Alexander Fleming
2000
All organisms are made of cells

All existing cells are produced by other living cells.

The cell is the most basic unit of life
Spontaneous Generation
First living microorganisms
Observed first cells and named them
Hypothesized that maggots do not spontaneously generate from meat
Supported Spontaneous Generation: Boiled chicken broth and noticed bacterial growth several days later
Repeated Needham's experiment but sealed the flask and created a vacuum. No bacterial growth but work was criticized.
Created the first vaccine for smallpox from Cowpox.
Finally discarded the notion of Spontaneous Generation with his award winning experiment with Swan neck flasks.
The Experiments:
Needham
Spallanzani
Pasteur
http://bcs.whfreeman.com/thelifewire/content/chp03/0302003.html
1. Why was Spallanzani criticized?
2. Why was Pasteur supported?
3. What are the differences and similarities between the three experiments?
Reflect
Developed first antibiotic intended for human use, penicillin
How big is a cell?
http://learn.genetics.utah.edu/content/begin/cells/scale/

Transport
Cell Membrane

Vesicle

Golgi Apparatus
Energy
Chloroplast

Mitochondria
Replication
Nucleus (DNA)


Centrioles
Protein/Function
Nucleus (mRNA)

Endoplasmic Reticulum

Ribosomes

Lysosomes
Structure
Cell Wall

Cytoskelton

Vacuole

Cytoplasm
Full transcript