cell chemistry and biosynthesis. overview major atoms covalent bonds, ionic bonds water,...
TRANSCRIPT
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• Cell Chemistry and Biosynthesis
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Overview
• Major Atoms• Covalent bonds, Ionic bonds• Water, non-covalent force in water• Four major families of small molecules• Sugar, fatty acids, amino acids, nucleotides• Three macromolecule families: polysaccharide,
protein, nucleic acid • Non covalent bonds determine molecular shape
and interactions
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The Chemical Components of A Cell
• Basic Element: Atom, protons, Neutrons, Electrons
• Atomic Weight, Molecular Weight
• Avgadro’s number (6x1023 molecules), Mole (1 mole= 6x1023 molecules), Molar solution (1M=1mole/liter)
• Electron shells (2,8,8,18,18)
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Carbon and Hydrogen
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Chemical Elements for Live Organisms
H, C, O, and N make up 96.5% weight of a living organism
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The Chemical Bonds
• Ionic Bonds, Covalent Bonds
• Bond length and bond strength
• Covalent bonds: Single bond, double bond, polar bond
• Van der waals force
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Covalent Bond and Ionic BondIonic bond: electron transfer
Covalent bond: electron sharing
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Sodium Chloride: ionic bond formation
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The geometry of covalent bonds
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Important Energy Levels
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The Van der Waals forces
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The Water Environment
• 70% of cell is water• Hydrogen bond• Hydrophilic and hydrophobic• Acid and base• Proton and hydroxyl• Non-covalent interactions in water: Ionic
bonds, hydrogen bonds, van der waals attractions, hydrophobic force
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AcidDonate a proton
BaseAbsorb a proton or donate OH-
NH3+H2O->NH4++OH-
NaOH->Na++OH-
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Ionic bonds in Water
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Hydrogen bondPolar interaction: a
elecgtropositive hydrogen is shared by two neighboring
electornegative atoms
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Molecular Interaction in solution1. H-bond (hydrogen bond), 2. Ionic bond, 3. Van der Waals
4. Hydrophobic “force”
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Four Major Families of Small Organic Molecules
• Sugars-> polysaccharides
• Fatty acids -> fats, lipids, membranes
• Amino acids -> proteins
• Nucleotides -> nucleic acids
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Four Major Small Organic Molecules
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Sugar [(CH2O)n, carbohydrates]Glucose
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Disaccharide Condensation and hydrolysis
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Fatty Acids
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Phospholipid (amphipathic)
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Amino Acid
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Amino Acid and pH values
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Peptides and proteins
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ATP (ribonucleotide adenosine triphosphate)
Nucleotides
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Nucleotides and DNA, RNADNA: deoxyribonucleic acids
A(adenine) G(guanine) T(thymine) C (cytosine)
RNA: ribonucleic acidsA G U(Uracil) C
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Macromolecules
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Three families of macromolecules
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The assembly of macromolecules