7 Unit 2: Cells. Vocabulary Cells Cells Are Awesome!
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Transcript of 7 Unit 2: Cells. Vocabulary Cells Cells Are Awesome!
7Unit 2: Cells
Students will understand that the organs in an organism are made of cells that have structures & perform specific life functions
Vocabulary
Cell
Tissue
Organ
System
Cytoplasm
Nucleus
Osmosis
Diffusion
Membrane
Chloroplast
Cell wall
Lysosome
Endoplasmic Reticulum
Vacuole
Mitochondria
Ribosomes
Cells
How big are cells?
What is in a cell?
How are these tiny things responsible for life functions? What is it they actually do?
Are there cells with specific functions which differ from other cells?
Organelles
Cell wall
Cell membrane
Nuclear membrane
Nucleus
Nucleolus
Mitochondria
Endoplasmic reticulum
Ribosomes
Golgi bodies
Chloroplasts
Vacuoles
Lysosomes
Cytoplasm
Plant Cells vs. Animal Cells
Different Shape Plant cells are usually
rectangular
Animal cells do not have a definite shape
Plant Cells vs. Animal Cells
Different Structures
Plant Cell
Cell wall
Chloroplast
Large vacuole
Animal Cell
No cell wall
Lysosomes
No chloroplast
Bacteria vs Plant & Animal
What makes bacterial cells different from plant or animal cells?
Size – bacteria are much smaller
Nucleus – bacteria don’t have one
Some bacteria have a cell wall
Organelles
Make a chart in your notes about organelles. List the organelles, what it does, and if it is in a plant and/or animal cell.
Cell Wall
Provides support and protection
Allows water, carbon dioxide, and oxygen to pass in and out of cell
Only in plant cells
Cell Wall
Cell Membrane Supports and protects cell
Controls what goes in and out of cell
In both plant and animal cells
Surrounds the outside of animal cells
Inside cell wall in plant cellsCell Membrane
Nuclear membrane
Protects nucleus
Controls what moves in and out of nucleus
In plant and animal cells
Mitochondria
Breaks down sugar molecules into energy
“mighty mitochondria makes energy”
Plant and animal cells
Chloroplasts
Contains chlorophyll
Uses carbon dioxide, water and light energy from the sun to create food for the plant
Photosynthesis
Only in plants
Organelles
On pg 20, draw a plant cell and an animal cell.
Be sure to include all the organelles listed
List the name and function of the organelles
COLOR IT (30 pts)
Specialized Cells
Are all the cells in our body, or another animal’s body, identical? Do they all do the exact same thing?
In multi-celled organisms, cells are most likely organized into tissues
Those tissues are organized into organs
Those organs are organized into systems
Movement In & Out
How do substances move into and out of a cell?
Diffusion is the movement of particles (tiny) into and out of a cell based on the “gradient”
The “gradient” means that particles travel FROM and high concentration TO a low concentration
Osmosis
Diffusion or movement of WATER from an area of high concentration to an area of low concentration.
WATER ONLY
Vital to life and all living things
Active Transport
Movement of particles too large to use diffusion or osmosis
Requires assistance to get in or out
May require energy from the cell
Against the gradient
Movement In & Out
Osmosis is the diffusion of water into or out of a cell (think water-logged versus dehydration)Low water
Lots of water
Cells on the Computer
Go to: http://www.schools.utah.gov/curr/sci/secondary/7thGradeWebResources.htm
Explore through the last 7-8 activities. Some links are broken, just move to another one.
Cell Review
http://www.cellsalive.com/cells/cell_model.htm
Complete the following review questions from your book:
Pg 24: 1, 2, 4 (think back to characteristics of bacteria)
Pg 37: 1, 2
Pgs 39-41: 1-3, 5-10, 11-12, 15-17, 19, 20, 24-26