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Human Biology Chapter 2 and 3
Goodenough and McGuire 4th Edition
20
Biology
Undergraduate 1
01/30/2013

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Term
Element
Definition
A pure form of matter containing only one kind of atom
Term
Radioisotopes
Definition
Unstable, radiations-emitting isotopes
Term
Compound
Definition
Two or more elements combined to form a new chemical substance
Term
Atomic Number
Definition
The number of protons in the nucleus of an atom of a given element, and also the number of electrons normally surrounding the nucleus.
Term
Atomic Mass
Definition
The number under the symbol on the table; protons plus neutrons
Term
Atoms
Definition
The smallest form of an element; contains protons, neutrons, and electrons
Term
Isotopes
Definition
atoms with the same number of protons but different number of neutrons
Term
Ion
Definition
An atom that carries an electric charge resulting from the loss or gain of electrons
Term
Ionic Bond
Definition
A chemical bond that forms from the mutual attraction of oppositely charged ions
Term
Covalent Bonds
Definition
Share electrons
Term
Polar Molecules
Definition
Have a partially positive or partially negative charge
Term
Hydrogen Bonds
Definition
A weak bond formed between a partially positively charged hydrogen atom in a molecule and a partially negatively charged atom in another molecule
Term
Base
Definition
Any substance that reduces the concentration of hydrogen ions in solution. Any pH greater than 7
Term
Acids
Definition
Any substance that increases the concentration of hydrogen ions in solution. pH less than 7
Term
pH
Definition
a measure of hydrogen ion concentration of a solution
Term
Buffers
Definition
prevent dramatic changes in pH by removing or adding hydrogen ions
Term
Carbohydrates
Definition
Provide fuel for the body and come in the form of sugars and starches
Term
polymers
Definition
macro molecules made of small repeating molecular sub-units liked in a chain
Term
monosaccharides
Definition
simple sugars; the smallest molecular units of carbs,
Term
polysaccharides
Definition
complex carbs that from when monosaccharides join together in long chains
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