CHEM130A/MCB100A Course Website

109: 285 Cory Hall 11-12PM Friday CCN: 12914

9-10AM Wednesday 113 Donner Hall

10AM-11AM Friday 113 Donner Hall

Quiz-2 100705 Solutions- Chptr 4 of JK's book - open book

Quiz-3A 110405 Solutions - Chptrs 6 and 7 of JK's book - open book

Quiz-3B 110905 Solutions - Chptrs 6 and 7 of JK's book - open book

Quiz-3C 111105 Solutions - Chptrs 6 and 7 of JK's book - open book

Practice-exam1 113005 Solutions

Quiz-4 120205 Allostery, co-operativity, enzyme kinetics - Closed Book

Practice-exam2 120505

Email: aathavan@ocf.berkeley.edu

Van der Waals forces in the gecko

Why Nature Chose Phosphates

Hydrophobic effect at different length scales

Errata: The orbitals involved in the octahedral coordination in Mg(II) are six sp3d2 hybridised orbitals

Fun Papers:

Bacteriorhodopsin-the movie

Everything you always wanted to know about WATER but were afraid to ask

Invention of the Genetic Code A great historical narrative of the brilliant yet wrong predictions on the genetic code - an exercise in systematic counting

The Paracelcus Challenge Can two proteins with greater than 50% sequence identity have completely different folds?

SCOP fold statistics

Energy&Entropy a quick look -2

Energy&Entropy a quick look -3

In brief: To find for example 69! the keys you would press are

69 PRB > > = =

Basically the PRB key pulls down a menu of nPr, nCr, !, RAND . You use your scroll keys to get to !. Then press Enter (=) to select !. Press Enter (=) again to get the answer.

For some pictures to illustrate the above, check pg 78 in this link

What do I need to know in Chptr6 for the Mid Term Exam-2? (101505)

Multiplicity concepts and how they relate to spontaneous evolution of a system. Essentially till pg 28 of Chptr6

About the bond energy for covalent bond: in textbook equ5.33, it wrote: U= k/2(r-r0)^2 on professor's note on the web p.9, it wrote: V= +V0 + k(r-ro)^2 Are they same and how they related to each other? (101505)

These are basically the same relations. I believe John used the version in 5.33 simply to illustrate that it is a harmonic (spring like) potential. U=Uo +k*(r-ro)^2 is the general form of the two. In this case the spring constant = k/2 (F=-dU/dr=spring constant*displacement from equilibrium) Do not get confused by the inconsistent use of k and k/2 as the constants.

why the stabilization energy at optimal bond length (V0)is negative? (101505)

The stabilization energy is negative if the two particles are attractive. The stabilization energy is simply the work done by you in bring the two particles together from infinite initial separation. If the particles attract each other then you have done negative work.