Topic: Cells
Aim: What are the types of organisms &
how are they organized?
Do Now: Explain two differences between
animal and plant cells.
http://www.youtube.com/watch?v=gfzVWG2DnQ4
HW: Work on your science fair project!
2 types 1.PROKARYOTIC CELL:
of cells
• NO NUCLEUS
• DNA in
cytoplasm
• No cell
organelles
• Ex: bacteria
Anthrax
Strep
Cholera
2.EUKARYOTIC CELLS:
• HAVE A NUCLEUS
• Larger
• Contain organelles
2 types of 1. Unicellular
organisms Organism:1-celled
organism
Ameba
Euglena
2. Multicellular Organism:
made up of many different
cells that work together
• Cells are SPECIALIZED
(have specific jobs)
• Ex: Muscle cells depend on
nerve cells to move
Nerve cells
Loose connective tissue
w ith f ibroblasts
Red blood cells
Bone tissue
w ith osteocytes
Smooth muscle cells
Fat (adipose) cells
Striated muscle cells
Intestinal epithelial cells
How are cells in a multicellular
organism organized?
Put these structures in the correct
order from least complex (simple)
to most complex:
Tissues
Systems
Cells
Organs
Organelles
1. Cells: specialized
•Examples:
–Red blood cells carry oxygen.
–Muscle cells help you
move.
2. Tissue: group of similar
cells that perform a
specific function
Blood cells  blood tissue
Muscle cells  muscle
tissue  movement
3. Organ: many tissues working
together
Heart =organ made of
muscle, nerve & blood tissue
4. Organ system: group of organs
working together to perform a
specific function
Skeletal & Muscular Systems
Circulatory System
5. Organism: a combination of
organ systems that work
together
• A living thing
Levels of organization
Muscle cell
Cells
Smooth muscle tissue
Tissues
Stomach
Digestive system
Organs
System
Organism
Let’s summarize…
1. Explain the difference between prokaryotic
and eukaryotic cells. Give examples of each.
2. Explain the difference between unicellular and
multicellular organisms.
3. Explain the type of cells that make up a
multicellular organism.
4. Explain the organization of an organism.
Did you know…
• Bacterial infections can be treated
with antibiotics.
Strep
Staph
E. coli
Did you know…
• The longest living cells in the body are
brain cells which can live an entire
lifetime.
Review:
1. Which statement describing the cells in a body
system is correct?
(1) Each cell in the system is identical to the other cells in
the system, and each cell works independently of the
other cells.
(2) Some cells in the system may be different from the
other cells in the system, but all cells are coordinated
and work together.
(3) Each cell in the system is different from the other
cells in the system, and each cell works independently
of the other cells.
(4) All cells in the system are identical to each other and
work together.
2. Which of the following is a primary
difference between prokaryotic and
eukaryotic cells?
(1) Prokaryotic contain a membrane-bound
nucleus.
(2) Prokaryotic contain DNA.
(3) Eukaryotic cells contain a membrane
bound nucleus.
(4) Eukaryotic contain DNA.
3. Which sequence represents the correct order of
levels of organization found in a complex
organism?
(1) Cells  organelles  organs  organ systems 
tissues
(2) Tissues  organs  organ systems  organelles
 cells
(3) organelles  cells  tissues  organs  organ
systems
(4) organs  organ systems  cells  tissues 
organelles
4. These groups of cells represent different
(1) tissues in which similar cells function together
(2) organs that help to carry out a specific life activity
(3) systems that are responsible for a specific life activity
(4) organelles that carry out different functions.
6. Which statement best compares a multicellular
organism to a unicellular organism?
(1) A multicellular organism has organ systems that
interact to carry out life functions, while a singlecelled organism carries out life functions without
using organ systems.
(2) A single-celled organism carries out fewer life
functions than each cell of a multicellular organism.
(3) A multicellular organism always obtains energy
through a process that is different from that used by
a single-celled organism.
(4) The cell of a single-celled organism is always much
larger than an individual cell of a multicellular
organism.
Review:
Put the following terms in order from
least complex to most complex:
Tissue
Organism
Cell
System
Organ
Organelle
1. What do prokaryotic cells contain?
2. What is a cell organelle found in a
eukaryotic cell and not in a
prokaryotic cell?
3. Explain the difference between a
unicellular and multicellular
organism.