Transcript Unicellular and Multicellular

What is an Organism?
Definition:
Organism – anything that can live on its own
Unicellular Organisms
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- an organism made of only one cell
- Called Prokaryotes:
- No nucleus
- Each organism has a way of moving,
obtaining food, and carrying out all other
functions essential for life.
Examples of
Unicellular Organisms
• Amoeba
• Paramecium
• Bacteria
• Protozoa
Multicellular Organisms
Definition:
Multicellular organism – an organism made of
two or more cells
Information:
These organisms are able to be seen with the
naked eye.
Multicellular Organisms
• Called Eukaryotes: Has a well formed nucleus.
• Has organelles which are parts of the cell that
carry out specific functions.
– Example: Mitochondria has the task of energy and
Chloroplasts has the task of photosynthesis.
• Has movement and a way of food production.
• Examples: Animals, plants, fungi, and protists
Make a T Chart in your notes
• Head to my homework site and follow the link
• You need to complete a T-Chart representing
the differences between unicellular and
multicellular organisms.
Cell Parts and Cell Size
Chapter 1.3
Page 28-35
Activities that Keep Cells Alive
• Obtaining materials and supplies for energy.
• Making products.
• Getting rid of wastes.
Organelles
• Are structures in a cell with a specific function
necessary for life.
• Many of these organelles have only been
discovered since the invention of the electron
microscope.
Differences between Plant and Animal Cells
• There are three differences with the plant cell
organelles that animal cells do not have.
– Plants and Fungi have a cell wall while animal cells
do not. Cell walls are made mostly of a tough
material called cellulose. They are thicker and
more rigid than cell membranes and provide
support.
Differences between Plant and Animal Cells
– Plant cells also have chloroplasts while animal
cells do not. Chloroplasts are the structures in
which the process of photosynthesis takes place.
Photosynthesis uses energy from the Sun to make
carbohydrates. Folded membranes inside each
chloroplast contain the green pigment chlorophyll,
which absorbs sunlight.
Differences between Plant and Animal Cells
– The third key difference is while both animals and
plants have vacuoles, the vacuoles in the plant
cells are much larger to be able to store more
water.
Cell Parts in Both Animals and Plants
• Cell Membrane: surrounds the cell and
protects it. But it also controls the movement
of substances in and out of the cell.
• Cytoplasm: a large part of the cell is taken up
by this supportive, jelly-like substance. It
helps distribute materials such as oxygen and
food throughout the cell.
Cell Parts in Both Animals and Plants
• Endoplasmic Reticulum:
Is a folded membrane
Forms systems of canals within cytoplasm
Materials are transported in canals to
different parts of the cell.
Cell Parts in Both Animals and Plants
• Nucleus:
– Controls the cells’ activities
– Contains the chromosomes
– Enclosed by a nuclear membrane that
controls what enters and leaves the cell.
Cell Parts in Both Animals and Plants
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Mitochondria:
Energy production for cell.
Tiny food particles broken down for energy.
“Powerhouse” of the cell.
Cell Size
• Why are cells sooo small?
• You are swimming in a pool…If the pool gets
bigger, what happens if you are trying to swim
across it several times?
Cell Size
• To carry out their work, cells need a constant
supply of materials such as oxygen, water and
food and get rid of waste.
• The only way in or out is through the cell
membrane.
• To grow bigger, organisms add more cells to
their bodies rather than grow bigger cells.
Chapter 1 Review
Page 36-37
Quiz on Friday!
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STUDY
What are the characteristics of life?
Microscope Handout (front and back)
Cell Worksheet (front and back)
Animal and Plant cell drawings with labels.
Notes
• If you are not here for the test, you will write
it on Monday during lunch.