A lipid made from fatty acids that have at least one double bond between carbon atoms. (liquid @ room temp)
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polar
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soluable in water
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Lipids
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macromolecule group used for long-term energy storage and cell membrane structure
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cholesterol
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the most common steroid; is a component of the cell membrane as well as the precursor to all other steroids
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phospholipid bilayer
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the main structure of the cell membrane, made of phospholipids that are arranged with the fatty acid tails packed together and the glycerol and phosphate heads facing water in an aqueous solution
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fatty acid
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monomer of a lipid made of a hydrocarbon chain and a carboxyl group
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sulfhydryl group
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-SH
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peptide bond
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covalent bond formed between the amino group and carboxyl group of neighboring amino acids
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hydrolysis reaction
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the process of adding a water molecule to break a polymer into monomers
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amphipathic
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having both hydrophobic and hydrophilic parts
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phospholipid
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amphipathic lipid made of two hydrocarbon chains, glycerol, and a phosphate group; makes up cell membrane
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amino acid
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building block (monomer) of proteins, composed of an amino group and a carboxyl group, a hydrogen atom, and an R-group
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methyl group
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CH3
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dehydration synthesis
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A reaction in which monomers are bonded together to form polymers by removing a water molecule
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polypeptide chain
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(protein) a long line of amino acids bonded together by peptide bonds
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glycerol
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a carbon alcohol that is hydrophilic; component of many lipids
suffix carbohydrates usually end in (gluc-ose, fruct-ose, malt-ose, galact-ose)
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Steroid
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lipid molecule with four fused carbon rings
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Nucleic Acid Examples
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DNA, RNA, (ATP and ADP are modified nucleic acids)
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macromolecules
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large organic biomolecules
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hydrophilic head
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another name for the polar phosphate group in a phospholipid
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ion
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atom becomes charged when it gains or loses an electron
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carbonyl group
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C=O
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Saturated Fat
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fat in which all three fatty acid chains contain all single bonds between carbon atoms. (solid @ room temp)
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the reason carbon is important to life
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1) carbon can form four covalent bonds with different elements; 2) carbon can form single, double, or triple bonds; 3) carbon is the main component of organic molecules; 4) all organic molecules contain carbon (carbohydrates, lipids, proteins, nucleic acids)
the attraction of like substances; water molecules are attracted to other water molecules; this is due to the hydrogen bonding between water molecules
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RNA
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ribonucleic acid; sugar-phosphate backbone with bases A, G, C, U arranged in single strand
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denatured
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a change in the shape of a protein due to chemical treatments, temperature, change of pH, or high concentrations of polar or nonpolar substances; may or may not be irreversible
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Tertiary Structure of a Protein
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3D protein structure resulting from interactions between R-groups of amino acids. Include hydrophobic and hydrophilic interactions, disulfide bridges, ionic and hydrogen bonds
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charge of the hydrogen atoms in a water molecule
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slightly positive
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nucleotide
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monomer of nucleic acids made up of a 5-carbon sugar, a phosphate group, and a nitrogenous base
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Nucleic Acids
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group of macromolecule that stores, transfers, and expresses genetic information
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evaporative cooling
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water carries the heat it absorbs away in sweat due to its high specific heat
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the reason insects can walk on the surface of water
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surface tension caused by the cohesion of water molecules
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charge of the oxygen atom in a water molecule
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slightly negative
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adhesion
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the attraction of unlike molecules; water molecules are attracted to other polar surfaces
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the reason ice floats in liquid water
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less dense as a solid; hydrogen bonds form crystalline structure that keeps the water molecules separate
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heat of vaporization
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the energy required to change water from a liquid to a gas
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high specific heat
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property of water in which water changes temperature very slowly with changes in heat due to hydrogen bonding
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Protein Examples
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antibodies, hemoglobin, enzymes, cell membrane channels and pumps, peptide and protein hormones
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purines
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double-ringed nitrogen base such as adenine or guanine
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Secondary Structure of a Protein
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alpha helix and beta pleated sheet resulting from hydrogen bonds
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Quaternary Structure of a Protein
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results when a protein consists of multiple polypeptide chains
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*how DNA differs from RNA
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*the sugar in DNA is deoxyribose; Thymine bonds with Adenine; DNA is double-stranded
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*how RNA differs from DNA
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*the sugar in RNA is ribose; Uracil bonds with Adenine; RNA is single-stranded
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Ionic Interaction
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the attraction between oppositely charged ions
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Proteins
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a macromolecule group made chains of amino acids used for gene expression, structure, transport, storage, enzymes, defense, etc.
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Primary Structure of a Protein
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the amino acid sequence of the polypeptide chain
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aqueous solution
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A solution in which water is the solvent.
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beta-pleated sheet
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sheet-like secondary structure of proteins due to hydrogen bonds
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anti-parallel
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term meaning that the two strands of a DNA molecule run in opposite direction of each other; one is upside-down to the other (5'-3' vs 3'-5')
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the reason water moves from the roots to the leaves of a plant
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adhesion of water to walls of xylem and cohesion between water molecules results in capillary action due to evaporation in leaves