biology review chapters 3 - 4 key concepts covered so far
TRANSCRIPT
Biology Review Chapters 3 - 4
Key Concepts covered so far. . .
Looking at Cells
Microscopes enable biologists to examine cel ls in detai l
Looking at Cells
Scient ists use the metr ic system
( Internat ional System Measurement )
to measure the size of objects
Looking at Cells
Light microscopes have a low magni f icat ion and can be used to examine l iv ing cel ls
Looking at Cells
Electron microscopes have a high magni f icat ion but cannot be used to examine l iv ing cel ls
Looking at Cells
The scanning tunnel ing microscope uses a computer to generate three-dimensional images of objects
Cell Features
The cell theory has three parts
All living things are made of one or more cells
Cells are the basic units of structure and function in living organisms
All cells come from other cells
Cell Features
Smal l cel ls funct ion more eff ic ient ly than large cel ls
Cell Features
Al l ce l ls have a
• Cel l membrane• Cytop lasm• Ribosomes• DNA
Cell Features
Prokaryot ic cel ls lack internal compartments
Cell Features
Eukaryot ic cel ls have a nucleus and other organel les, as wel l as a cytoskeleton of microscopic protein f ibers
Cell Features
The l ip id bi layer of a cel l membrane is made of a double layer of phosphol ip id molecules
Cell Features
Proteins in cel l membranes include○ Enzymes○ Receptor p ro te ins○ Transpor t p ro te ins
Cell Organelles
The nuc leus o f a eukaryo t i c ce l l d i rec ts the ce l l ’s ac t i v i t ies and s to res DNA
Cell Organelles
In eukaryot ic ce l ls , an in ternal membrane system produces packages and d is t r ibu tes p ro te ins
Cell Organelles
Mitochondr ia harvest energy f rom organic compounds to create ATP
Cell Organelles
Lysomes are smal l spher ica l organel les that conta in the cel l ’s d igest ive enzymes
Cell Organelles
Plant ce l ls have three st ructures that animals lackA ce l l wa l lChlorop las tsCent ra l vacuo le
