Thermodynamics and HP effect Flashcards

1
Q

tendency of non-polar substances

A

aggregate in aqueous solution and exclude water molecules

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2
Q

biological systems

A

stabilising phospholipid membrane therefore formation of cells and cellular compartment
protein folding into 3D structure to be able to function

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3
Q

self assembly of lipids

A

bilayer sheets , micelles etc

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4
Q

free energy representation in unfolded state of protein

A

many formation causing large conformational entropy

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5
Q

free energy representation in folded native state

A

approximated by 1 formation causing a low conformational entropy

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6
Q

more folding

A

decreases free energy of folding

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7
Q

mixing substances equation

A

DG{mixing} = DH{mixing} - TDH{mixing}

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8
Q

finding DH{mixing}

A

2DH{a-b} - DH{a-a} - DH{b-b}

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9
Q

DH{a-b}

A

interaction energy A and B

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10
Q

if DG*>0

A

equilibrium is towards demixed state

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11
Q

DH* being close to 0

A

no strong contribution of interactions between molecules and water molecules - favour mixing
some slightly -ve that favour mixing

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12
Q

why TDS* is large and negative

A

entropy drives reaction towards demixing
it’s counterintuitive as mixing of 2 molecules in solution
therefore entropically favourable

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13
Q

if corner is replaced by HC atom

calculating no. microstates of water

A

halves as they cannot form H-bonds

therefore W=3

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14
Q

calculating change in entropy in presence of HC atom equation

A

DS* = S{in water} - S{onhydrophobic - surface}

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15
Q

model of water molecule

A

has 4 neighbours

forming 2 H-bonds

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16
Q

loss of entropy of water

A

caused by introduction to single HC atom perturbing orientation freedom of water (1.7KJmol-1/0.41Kcalmol-1)

17
Q

joules to calories

A

1j = 0.24cal

18
Q

2 major organising factors in living system

A

membrane assembly

protein folding

19
Q

membrane assembly in living system

A

minimises exposure of HC chains to water maximising entropy of water in presence of phospholipid

20
Q

protein folding in living system

A

minimising exposure of HC chain containing side chains to water - maximising entropy of water

21
Q

core of scientific endeavor

A

data gathering
analysis
model making
interpretation