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Chapter 3 Vocab Words for Final
Mr. Hobbs Vocab Words for final
12
Science
7th Grade
06/12/2010

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Term
Element
Definition
It is a substance that can't be broken down into simpler substance
Term
Selective Permeability
Definition
The cell membrane that seperates the cell from the outside environment which means some substances can pass through the cell membrane while others can't, if the cell needs that substance they will let it in if they do not need it they won't let it in.
Term
Diffusion
Definition
It is the main method by which small molecules move across the cell membrane, it is a process in which molecules from higher concentration move to lower concentrations 
Term
Osmosis
Definition
The diffusion of water molecules through a selectively permeable membrane, cell's can't function properly without water, many cellular processes depend on osmosis
Term
Passive transport
Definition
Materials pass through the cell membrane without using the cell's energy
Term
Active transport
Definition
It requires the cell's energy to transport protein across the cell membrane
Term
Photosynthesis
Definition
Plants and some other organisms use energy from the sun to convert carbon dioxide and water into oxygen and sugar
Term
Respiration
Definition
The process by which cells obtain energy from glucose, cells break down simple food molecules such as sugar and release the energy they contain
Term
Mitosis
Definition
The stage during which the cell's nucleus divide into two new nuclei, one copy of the DNA is distributed into each of the daughter cells 
Term
Parts of Mitosis
Definition

Prophase

Metaphase

Annphase

Telophase

Term
Chromosomes
Definition
thread - like chromatin in the nucleus during prophase they shrink to form double rod structures
Term
Replication
Definition
During Interphase the cell makes an exact copy of the DNA in the nucleus 
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