DO NOW THURSDAY
• What cell part does photosynthesis happen
in?
• What cell part does cell respiration happen
in?
TODAYS PLAN
•
•
•
•
Explain that a cell is the smallest living unit.
Describe specialized cells.
Describe an organelle.
Describe the function of the nucleus, chloroplast, mitochondria, cell
membrane, and cell wall.
• Discriminate among the different functions of the nucleus,
chloroplast, mitochondria, cell membrane, and cell wall.
• Develop and use a cell model to describe the function of a cell as a
whole and ways that parts of the cell contribute to the function
(specifically cell wall and cell membrane)
TODAYS DO
• We will complete a foldable as we learn about cells and their parts.
• You need to be thinking about how the jobs these cell parts perform
can be compared to the jobs that other objects perform for a project
we will do tomorrow.
Cells and Cell Organelles
Cells
• Cells are the smallest LIVING things.
• Cells in an organism can become
specialized to do special jobs.
Cells
• For example, muscle cells are long and
ropelike to allow muscles to stretch (relax)
and bounce back (contract).
Cells
• While nerve cells are very long and
branched like wires to allow them to send
electrical signals all over your body.
CELL PARTS
• Are called ORGANELLESsmall “organ” in a cell with a
specific function (job)
• Can be compared to the parts of
lots of other things because they
have similar functions
CELL MEMBRANE
• Acts as a barrier-controls what gets
in and out of cell
Like the skin of your body
Cell membrane------------
CYTOPLASM
• Gel-like goo that holds
organelles
---------------cytoplasm
NUCLEUS
• Control Center of Cellcontrols all cell activities
Like your brain
}--
nucleus
NUCLEAR ENVELOPE
•
Encloses the nucleus
Image from: http://www.agen.ufl.edu/~chyn/age2062/lect/lect_06/5_11.GIF
Nuclear envelope-------
NUCLEOLUS
• Dark area in nucleus where
ribosomes are made
Nucleolus-------------
CHROMATIN
• “strings” of DNA + protein
inside nucleus
----------------chromatin
MITOCHONDRION
(plural=MITOCHONDRIA)
• Powerhouse of cell- where
energy is released from food
–cell respiration
Like the food you eat
----mitochondrion
RIBOSOMES
• Makes proteins for cell
-----ribosomes
ENDOPLASMIC RETICULUM
• Provides passageways for
materials to move through
the cell
Like blood vessels in your body
Endoplasmic reticulum------
GOLGI BODY
Image from: http://www.rsbs.anu.edu
• Packages and
ships
materials
out of cell
Like your large intestine
Animation from: http://www.franklincollege.edu/bioweb/A&Pfiles/week04.html
See a Golgi movie
-----Golgi body
It’s ALL connected!
ANIMAL CELLS ONLY
• Cytoskeleton
• Small vacuoles
• Lysosomes
CYTOSKELETON
• Gives cell shape and support
Like the skeleton of your body
Cytoskeleton--------------------
SMALL VACUOLES
• Storage “sacs”
Vacuole---------
LYSOSOMES
Animation from: http://vilenski.org/science/safari/cellstructure/lysosomes.html
• Digest food and get rid of “trash”old organelles, bacteria, etc.

Lysosome---
PLANT CELLS ONLY
• Cell wall
• HUGE Central
vacuole
• Chloroplasts
CELL WALL
http://www.windows.ucar.edu/kids_space/images/brick_wall.jpg
• Supports and
protects the
plant cell and
gives it shape
Cell wall-------------------
CENTRAL VACUOLE
• Storage space for
WATER, food, and
wastes
------------Central vacuole
CHLOROPLASTS
• Use energy from
sunlight to make
own food (glucose)photosynthesis
http://stallion.abac.peachnet.edu/sm/kmccrae/BIOL2050/Ch1-13/JpegArt1-13/04jpeg/04-28_chloroplasts_1.jpg
--Chloroplast