Cell Structure & Function. Outcome addressed today!! 304-4illustrate and explain that the cell is a...
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![Page 1: Cell Structure & Function. Outcome addressed today!! 304-4illustrate and explain that the cell is a living system that exhibits all of the characteristic.](https://reader036.fdocuments.in/reader036/viewer/2022070415/5697bf731a28abf838c7f09e/html5/thumbnails/1.jpg)
Cell Structure & Function
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Outcome addressed today!!
• 304-4 illustrate and explain that the cell is a living system that exhibits all of the characteristic of life.
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Cell Theory
• All living things are made up of cells.
1) Cells are the smallest working units of all living things.
2) All cells come from preexisting cells through cell division.
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Definition of Cell
A cell is the smallest unit that is capable of performing life
functions.
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WHAT IS AN ORGANISM?
• a living thing that has (or can develop) the ability to act or function independently
• An individual living system, such as animal, plant or micro-organism, that is capable of reproduction, growth and maintenance.
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Examples of Cells
Amoeba Proteus
Plant Stem
Red Blood Cell
Nerve Cell
Bacteria
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Plant Animal
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“Typical” Animal Cell
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“Typical” Plant Cell
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Cell Parts
Organelles
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Surrounding the Cell
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Cell Membrane
• Outer membrane of cell that controls movement of materials in and out of the cell
• Double layer
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Cell Wall
• Found in plant cells & bacteria
• Supports cells (outer layer)
• Protects against water loss
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Inside the Cell
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Nucleus
• Directs cell activities
• Near the center of the cell
• Contains genetic material - DNA
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Nuclear Membrane
• Surrounds nucleus• Made of two layers• Openings allow
material to enter and leave nucleus
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Chromosomes
• In nucleus• Contain genetic
information (characteristics)
• Made of DNA
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Nucleolus
• Inside nucleus• Contains RNA to build
proteins
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Cytoplasm
• Gel-like mixture
• Surrounded by cell membrane
• Holds all the organelles
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Endoplasmic Reticulum• Moves materials and
messages around the cell• Smooth type: lacks
ribosomes• Rough type (pictured):
ribosomes embedded in surface
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Ribosomes 803
• Each cell contains thousands
• Make proteins• Found on rough
endoplasmic reticulum & floating throughout the cell
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Mitochondria
• Produces energy (power house of the cell)
• Controls level of water and other materials in cell
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Golgi Bodies 802
• Protein 'packaging plant‘ and secretes (gets rid of waste)
• Move materials out of the cell
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Lysosome• Contains digestive
enzymes • Transports undigested
material to cell membrane for removal
• Destorys bacteria and old cell parts
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Vacuoles
• Membrane-bound sacs for storage of water and waste
• Help plants maintain shape
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Chloroplast
• Found in plant cells• Contains green
chlorophyll• Traps suns energy
and makes food
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Cell Parts and FunctionsCiliaShort hair-like projections Used for movementLocation: outside of cell
FlagellaLong whip-like tailUsed for movementLocation: outside of cell
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