biochemistry notes. carbon organic molecules contain carbon. carbon has 4 electrons available for...
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Biochemistry Notes
Carbon• Organic
molecules contain carbon.
• Carbon has 4 electrons available for bonding.
•
Isomers
• Have same chemical formula but different three dimensional structure
Polymer
• Polymer - a molecular chain made up of smaller molecules bonded together (poly = many)
Monomer
• Monomer - 1 subunit of a polymer (mono = one)
• Glucose is an example of a monomer
Macromolecules
• Macromolecule - large organic molecule made up of polymers
Carbohydrates• Organic compound made up of C, H & O• Store and release energy• Monosaccharide (glucose:C6H12O6,
fructose)• Disaccharide - 2 monosaccharides
(glucose + fructose = sucrose)• Polysaccharides (starch, cellulose,
glycogen) - food storage and cell structures– Glycogen - animal cells– Starch - plant energy – Cellulose-plant cell struct.
Polysaccharide
Cellulose in a Plant
Lipids• Monomers are fatty
acids • Ex.– fats, oils, &
phospholipids in cell membranes
• Non-polar - insoluble in water
• Structure– 3 fatty acids bonded to glycerol
Lipid function
Long-term energy storage, insulation, cell structure (lipid bi-layer/cell membrane)
Saturated Fatty Acid
•
• Solid at room temperature
• Bad for heart
• Meat, butter
• Contain lots of hydrogen atoms and carbons are linked with single bonds in fatty acid chain
Unsaturated Fatty Acid• Liquid at room
temperature• Good for your heart• Olive oil, nuts, fish.
• Contain few hydrogen atoms because carbon
atoms have double bonds in fatty acid
chain.
ProteinsProteins provide
structure (skin, hair, cartilage, muscle) and are carry out all cell metabolism (enzymes)
The shape determines function
Monomer—amino acidsLinked together by
peptide bonds (type of covalent bond)
Protein Structure• Primary – amino acid
sequence• Secondary - hydrogen
bonding between a.a.’s – causes twisting; 2-D shape
• Tertiary - additional folding – functional protein; 3-D shape
• Quaternary - 2 or more amino acid (polypeptide) chains– complex
Primary Structure
Secondary Teritary
Quaternary
Nucleic Acids• Macromolecule that stores and
transfers genetic material• Made up of nucleotides
– made up of a sugar, a phosphate group, and a nitrogen base
• DNA: deoxyribonucleic acid• RNA: ribonucleic acid
Nucleotides
Reactions of Polymers• Dehydration
Synthesis – small molecules are linked together to form large molecules
• Lose one molecule of water when this happens
• Hydrolysis – large molecules are broken down into smaller molecules.
• Water molecule is used to break up the polymer
Dehydration Synthesis
• Also called condensation reaction
• Two molecules become covalently bonded to one another
• One molecule looses OH – the other looses H to form water H2O
Hydrolysis
Molecule is split into two parts by reacting with water. One of the parts gets an OH- from the water molecule and the other part gets an H+ from the water.