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SAT II Biology: Molecules of Biology
From the Princeton Review SAT II Biology E/M. DNA, RNA, Lipids, Carbohydrates, all the good stuff.
39
Biology
11th Grade
08/04/2010

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Term
Atoms
Definition
The fundamental units of the physical world.
Ex: H
Term
Molecules
Definition
When atoms combine through chemical reactions.
Ex: H2
Term
Compound
Definition
When a molecule has two different types of atoms.
Ex: CCl4
Term
Element
Definition
The smallest particle of an atom
Term
Reactants
Definition
On the left side of an equation
Term
Products
Definition
On the right right of an equation, the results.
Term
Organic
Definition
With Carbon
Term
Inorganic
Definition
Lacking Carbon.*
*Except Carbon Dioxide is still considered Inorganic.
Term
Polymers
Definition
More than one macromolecules
Term
Monomer
Definition
One macromolecules
Term
Amino Acids
Definition
The backbone: NH2 bonded with C, bonded with H, bonded with C, double bonded with O and bonded with OH. and the R on the bottom always varies.
Protein is a polymer of amino acids.
Term
Amino group
Definition
NH2
Term
Double Bond
Definition
When a atom is bonded twice, usually involves Carbon.
Term
Carboxyl Group
Definition
The O C and OH of the Amino acid back bone.
Term
Protein
Definition
Polymers of amino acids.
Also known as polypeptide.
Term
Peptide Bond
Definition
A bond between two amino acids which results in the release of water. (Dehydration synthesis)
It can be broken through hydrolysis (water molecule added to the structure)
Term
Dehydration Synthesis
Definition
When a water molecule is released/removed.
Term
Hydrolysis
Definition
When a water molecule is added to the structure.
Term
Saccharide
Definition
"Sweetness"
Monomer of what Carbohydrates are made of
Term
Monosaccharides
Definition
One single saccharide = a carbohydrate
Term
Glucose
Definition
A carbohydrate.
C6H12O6.
Double bonds on top of carbon.
Can form ring structure.
Term
Fructose
Definition
Same structure as Glucose, C6H12O6 but double bonds with 2nd Carbon from top.
Term
Disaccharide
Definition
Di = TWO.
Two monosaccharides linked.
Term
Maltose
Definition
A type of disaccharide.
Formed when 2 glucose link and a water molecule is released.
C12 H22 O11
Term
Sucrose
Definition
Table sugar.
Formed with 1 Glucose + 1 Fructose - 1 water molecule.
C12 H22 O11
Term
Polysaccharide
Definition
When more than 2 monosaccharides link.
Term
Glycogen
Definition
A type of polysaccharides.
Polymer of glucose.
Form in which animals (and humans) store glucose.
Term
Starch
Definition
Polymer of glucose.
Form in which plants store glucose.
Polysaccharide. Carbohydrate.
Term
Cellulose
Definition
Polymer of Glucose.
Polysaccharides. Carbohydrate.
Found in stems, leaves, and woods.
Usually forms plant walls.
Term
Hydrocarbon
Definition
A monomer for a lipid
Term
Hydrophobic
Definition
Non-polar.
Doesn't interact well with water.
Term
Triglycerides
Definition
A type of lipid found within the body.
3 fatty acids combined with one glycerol (An alcohol with 3 Carbon atoms) molecule.
Term
Phospholipids
Definition
A type of Lipid found within the body.
Same as Triglycerides but one fatty acid is replaced with a Phosphate group (-PO3 ^2-)
The phosphate group is hydrophilic!
Term
Hydrophilic
Definition
Friends with water.
Polar
Term
Lipid Bilayer
Definition
A phosphate (polar) ball linked with a fatty acid (non-polar) string. = cell membrane
Term
DNA
Definition
A nucleic Acid
found in the nucleus.
Made up of sugar, phosphate, and a base.
4 possible bases: Adenine, Cytosine, Guamine, and Thymine.
Attains two strands (Double helix!)
Term
RNA
Definition
Single stranded molecule.
Same bases as DNA except Thymine is replaced with Uracil.
Term
Adenine
Definition
Bonds with Thymine.
With 2 hydrogen bonds.
Term
Guamine
Definition
bonds with Cytosine
with 3 hydrogen bonds on the DNA
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