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Exploring Life CH 5
Biological Compounds
56
Biology
9th Grade
09/21/2009

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Term
organic molecule
Definition
carbon based compound
Term
inorganic molecule
Definition
NON-carbon based compound
Term
hydrocarbon
Definition
organic molecule made of only carbon and hydrogen
Term
functional group
Definition
group of atoms bonded to a compound that behaves in predictable ways
Term
hydrophilic
Definition
attracts water molecules
Term
monomer
Definition
small molecules that make up larger molecules
Term
polymer
Definition
large molecule made up of smaller molecules (monomers)
Term
carbohydrate
Definition
organic compound made up of sugar molecules
Term
monosacharide
Definition
sugar that contains one sugar unit
Term
disacharide
Definition
sugar that contains two monosacharides
Term
polysaccharide
Definition
sugar that is made up of 3 or more monosaccharides
Term
starch
Definition
polysaccharide in plant cells that consists entirely of glucose monomers
Term
glycogen
Definition
polysaccharide in animal cells (animal version of starch)
Term
cellulose
Definition
polysaccharide consisting of glucose monomers that reinforces plant-cell walls;
Term
lipid
Definition
aka fats & oils, they are hydrophobic
Term
hydrophobic
Definition
water avoiding molecules
Term
fat
Definition
organic compound consisting of a three-carbon backbone (glycerol) attached to three fatty acids
Term
saturated fat
Definition
fat in which all three fatty acid chains contain the maximum possible number of hydrogen atoms
Term
unsaturated fat
Definition
fat with less than the maximum number of hydrogens in one or more of its fatty acid chains
Term
steroid
Definition
lipid molecule with four fused carbon rings
Term
cholesterol
Definition
steroid molecule present in the plasma membranes of animal cells
Term
protein
Definition
polymer constructed from a set of 20 amino acid monomers
Term
amino acid
Definition
monomer that makes up proteins; contains carboxyl and amino functional groups
Term
polypeptide
Definition
chain of linked amino acids
Term
denaturation
Definition
loss of normal shape of a protein due to heat or other factor -loses function
Term
activation energy
Definition
minimum amount of energy required to trigger a chemical reaction
Term
catalyst
Definition
agent that speeds up chemical reactions
Term
enzyme
Definition
specialized protein that speeds up chemical reactions
Term
substrate
Definition
specific reactant acted on by an enzyme
Term
active site
Definition
region of an enzyme into which a particular substrate fits
Term
Name the 4 groups of biological compounds:
Definition
carbohydrate, lipid, protein, nucleic acid
Term
How many bonds can a single carbon atom form?
Definition
4
Term
What kind of reaction occurs when monomers are linked?
Definition
dehydration reaction
Term
What molecule is released during a dehydration reaction?
Definition
water
Term
What kind of reaction occurs when polymers are broken down/apart?
Definition
hydrolysis reaction
Term
What molecule is required for a hydrolysis reaction?
Definition
water
Term
Which type of carbohydrate is utilized for short term energy?
Definition
Sugars
Term
Which type of carbohydrate is utilized for longterm energy sources?
Definition
starches
Term
Which biological molecule is made up of C,H, and O only in ratios of 1:2:1
Definition
Carbohydrates
Term
Steroids fall into which category of biological molecules?
Definition
Lipids
Term
Name 3 uses of oils/fats/lipids
Definition
1. insulate body temperature
2. Store energy
3. Used to form cell membranes
Term
steroid
Definition
a form of a lipid that is a chemical messenger
Term
What are the monomers that make up the polymers proteins?
Definition
amino acids (20 different kinds)
Term
Give three functions/uses of proteins.
Definition
1. Found in muscles and hair
2. Part of immune system
3. Chemical messengers
Term
Name the four parts of an amino acid:
Definition
Carboxyl group
Hydrogen
Amine group
"Function group" varies with each a.a.
Term
What are two things that influence the shape of a protein?
Definition
1. Temperature
2. pH
Term
What are the 2 types of Nucleic Acids?
Definition
DNA and RNA
Term
What is different about DNA vs. RNA?
Definition
The type of sugar
Term
What is the monomer of the polymer carbohydrates?
Definition
sugars
Term
What is the monomer that makes up a nucleic acid?
Definition
nucleotides
Term
What is the monomer that makes up a nucleic acid?
Definition
nucleotides
Term
Give the 3 parts that make up a nucleotide:
Definition
1. Sugar
2. Phosphate
3. Nitrogen Base
Term
How many different types of nitrogen bases are there?
Definition
2: Purines & Pyrimidines
Term
Name the 4 nitrogen bases found in DNA
Definition
Adenine, Thymine, Guanine, Cytosine
Term
Name the 4 nitrogen bases found in RNA:
Definition
Adenine, Uracil, Cytosine, Guanine
Term
Why does a purine always pair with a pyrimidine?
Definition
It maintains a constant width of "rung" on the DNA molecule
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