Midterm 1 Review P1

Midterm 1 Review P1 - MCB100A CHEM C130 Midterm 1 Review...

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MCB100A’/’CHEM’C130’ Midterm’1’Review’ Varsha’Desai’ Jenny’Lin’
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Molecular’InteracCons’ Thermal’Energy:’ k B T’=’2.5’kJ/ mol’(300’K)’ Interac(on Sources of Interac(on Interac(on Distance ±Å) Stabiliza(on Energy ±kJ/ mol) Interac(on Range Van der Waals Transient’ fluctuaCon’of’ electron’clouds ’ 3.6’ -1’ 1/r 6 (short’range) ’ H-Bonds Electric’dipoles’ from’polarized’ covalent’bond’ ’ ~2.7-3.5’ ’ ’ ~-4—’-13’ ’ 1/r 3 Ion Pairs Full’charges’ ’ ~2.5’ ~-250’ (vacuum)’ ~-6—’-20’ (water)’ 1/r’ (long’range) ’ Hydrophobic ±lustering’away’ from’water ’ ’ ’ >-50’ ’ ’ Covalent Sharing’Electron ’ 1.5’ -200—’-800 ’ ’ ’
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Amino’Acids’
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PepCde’Bond’
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PepCde’Bond’–’ Ramachandran’ Diagram’
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H-Bond’Pa‘ern:’ i,’i+4’ excepCon’3 10 ’and’π’helices’(p.144)’ residue/turn:’3.6’ rise/residue:’1.5’Å’ rise/turn:’5-6’Å’ Φ’=’-60°’and’Ψ’=’-40°’ right’handed’(physiologically)’ sidechain’orients’outward’from’helical’axis’ amphipathic’helices,’hydrophobic’residue’
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