Download Cells and Cell Theory

TEKS: 6.12A, B
6.12A: You will understand that all
organisms are composed of one or more
cells.
Purpose: You will get to see and identify
the smallest unit of life! As well as learn
about who discovered cells and cell
theory.
Your goal is…
You will need to take a few notes, listen
and I will tell you when to write down
information.
 Title your page now:
“Cells and cell theory”

Note taking
Characteristics of
Living Things
You are surrounded by life, but how would
you define a living thing?
Living things:
1. are made of cells
2. Can reproduce
3. Use energy to survive
4. Have DNA
5. Respond to stimuli
6. Grow and develop
7. Use energy
8. Respond to stimuli
9. Maintain homeostasis
10. Evolve over time
A cell is the simplest structure of living
things
 If an organism is unicellular, all functions
of life happen within that one cell.
 If an organism is multicellular, the
different cells have different jobs and they
all work together

Write down these bullets!
All living things are made of cells
Simple Organisms

Some organisms are simple:
For example: Bacteria, Achaea, most
protists (unicellular)
Complex Organisms
Some organisms are more complex:
 “Complex” means that different parts of the
organism performs different functions.
Examples: humans, dogs, fish,
mushrooms, oak trees

How do living things grow?
 Organisms grow by adding more cells, not
by increasing the size of their cells

Growth of an organism
What do cells look like?
The word cell is Latin for “small room”
 They look as varied as the organisms they
build (make up)

Red Blood cell
Stem Cell
Brain cell
Plant cell
Within the structure of cells, are parts
that each have jobs to do
 The parts are called organelles
 Examples of organelles:

Cells have parts

1665 – Robert Hooke published a book that
described the cell
1. He looked at cork (a plant) under the
microscope (30x)
2. He noticed little compartments, which
he named “cells” because they resembled the
little rooms that monks lived in
The microscope led to the discovery of cells

1675 – Anton Van Leeuwenhoek is
considered the father of microscopy because of
the advances he made in microscope design and
use.
1. He looked at pond water under the
microscope (300x) and noticed that the water
was full of moving living things
2. He made the most advanced microscope
of his time
The microscope
led to the
discovery of cells
Microscopes
We use these to observe cells
 First compound microscope:
What you will use!
 With
the invention of the microscope
and the contributions of many
scientists, a very important question
was answered in the 1850’s. The
question was:
 Where
do cells come from?
The answer?
A “Cell Theory” was created!
The German scientists,
Schleiden and Schwann
developed The Cell Theory
Cell Theory
There are 3 concepts:
1.
2.
3.
All living things are composed of
cells
Cells come from other (preexisting) cells
Cells are the basic structure of
living things
In your Journal…
Double check that your notes are
complete.
2. Look at my example if needed.
1.
Cells and Cell Theory
is about…
Living organisms are organized into units called cells. More complex organisms are multicellular. Certain
characteristics define whether or not something is living.
Characteristics of Life
Cells
(How do you know it is alive?)
A cell is the ________ _________ of
living things
Living things…
All ________ _________ are made
of cells
1.
Are made of __________
Unicellular:
2.
Can _________________
All functions of life: ________
________________________
3. Use energy to ____________
Multicellular:
4. Have __________ to pass on
their genetics
The different cells: ________
________________________
5. Respond to ____________
in their environment
Simple organisms -
6. Grow and _____________
7. Use _____________
8.
Maintain ____________
9.
____________ over time.
Complex organisms -
The word cell means:
Cell parts are called: _____________
An ex. ________________________
______ – Robert Hooke
1. He looked at _____ (a
plant) under the
microscope
2. He noticed little compartments, he called these
_______.
1675 –_______________
is considered the father of
microscopy. He looked at
_______ ________ under a
microscope.
Cell Theory: Scientists:
3 concepts:
Brain Pop!

All about
cells!