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Module 5
Module 5 apologia biology words
25
Biology
9th Grade
10/24/2011

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Term
Matter
Definition
Anything that has add and takes up space.
Term
Model
Definition
An explanation or representation of something that can not be seen.
Term
Element
Definition
A collection of atoms that all have the same number of protons.
Term
Molecules
Definition
Chemicals that result from atoms linking together.
Term
Physical Change
Definition
A change that affects apperance but not the chemical makeup of a substance.
Term
Chemical Change
Definition
A change that alters the chemical makeup of elements or molecules of a substance.
Term
Phase
Definition
One of three forms - solid, liquid, or gas - which every substance is capable of attaining.
Term
Diffusion
Definition
The random motion of molecules from a high area of concentraion to an area of low concentration.
Term
Concentration
Definition
A measure of how much solute exists within a certain volume of solvent.
Term
Semi-permeable membrane
Definition
A membrane that allows some molecules to pass through but does not allow other molecules to pass through.
Term
Osmosis
Definition
The tendency of a solvent to travel across a semi-permeable membrane into areas of high solute concentration.
Term
Catalyst
Definition
A substance that alters the speed of a chemical reaction but is not usxed up in the process.
Term
Organic Molecule
Definition
A molecule that contains only carbon and any of the following: Hydrogen, Oxygen, Nitrogen, Sulfur, and/or Phosphorous
Term
Biosynthesis
Definition
The process by which living organisms produce larger molecules from smaller ones.
Term
Isomers
Definition
Two different molecules that have the same chemical formula.
Term
Monosaccharides
Definition
Simple carbohydrates that contain 3 to 10 carbon atoms.
Term
Disaccharides
Definition
Carbohydrates that are made up of two monosaccharides.
Term
Polysaccharides
Definition
Carbohydates that are made up of more than two monosaccharides.
Term
Dehydration Reaction
Definition
A chemical reaction in which molecules combine by removing water.
Term
Hydrolysis
Definition
Breaking down complex molecules by the chemical addition of water.
Term
Hydrophobic
Definition
Lacking any affinity to water.
Term
Saturated fat
Definition
A lipid made from fatty acids that have no double bonds between carbon atoms. (In solid form at room temperature)
Term
Unsaturated fats
Definition
A lipid made from fatty acids that have at least one double bond between carbon atoms. (In liquid form at room temperature)
Term
Peptide bond
Definition
bond that links amino acids together in a protein.
Term
Hydrogen bond
Definition
A strong attraction between hydrogen atoms and certain other atoms (usually oxygen or nitrogen)in specific molecules.
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