Exam (elaborations)

Solutions for Biomolecular Thermodynamics, 1st Edition Barrick (All Chapters included)

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Biotech

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Complete Solutions Manual for Biomolecular Thermodynamics, 1st Edition by Douglas Barrick ; ISBN13: 9781315380193. (Full Chapters included Chapter 1 to 14).... Chapter 1: Probabilities and Statistics in Chemical and Biothermodynamics. Chapter 2: Mathematical Tools in Thermodynamics. Chapter 3: T...

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solutions
manual
biomolecular
thermodynamics
1st edition
barrick
9781315380193
solutions manual
biomolecular thermodynamics
1e

Institution Biotech
Course Biotech

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Biomolecular Thermodynamics
1st Edition by Douglas Barrick

Complete Chapter Solutions Manual
are included (Ch 1 to 14)

** Immediate Download
** Swift Response
** All Chapters included

, Solution Manual

CHAPTER 1
1.1 Using the same Venn diagram for illustration, we want the probability of
outcomes from the two events that lead to the cross-hatched area shown
below:

A1 A1 ∩ B2 B2

This represents getting A in event 1 and not B in event 2, plus not getting A
in event 1 but getting B in event 2 (these two are the common “or but not
both” combination calculated in Problem 1.2) plus getting A in event 1 and B in
event 2.

1.2 First the formula will be derived using equations, and then Venn diagrams
will be compared with the steps in the equation. In terms of formulas and
probabilities, there are two ways that the desired pair of outcomes can come
about. One way is that we could get A on the first event and not B on the
second ( A1 ∩ (∼ B2 )). The probability of this is taken as the simple product, since
events 1 and 2 are independent:

pA1 ∩ ( ∼B2 ) = pA × p∼B
= pA × (1− pB ) (A.1.1)
= pA − pA pB

The second way is that we could not get A on the first event and we could get
B on the second ((∼A1 ) ∩ B2 ) , with probability

p( ∼ A1 ) ∩ B2 = p∼ A × pB
= (1− pA ) × pB (A.1.2)
= pB − pA pB

K10030_Solution Manual.indd 1 10-07-201

, 2 Solution Manual

Since either one will work, we want the or combination. Because the two ways
are mutually exclusive (having both would mean both A and ∼A in the first
outcome, and with equal impossibility, both B and ∼B), this or combination is
equal to the union { A1 ∩ (∼ B2 )} ∪ {(∼ A1 ) ∩ B2 }, and its probability is simply the sum
of the probability of the two separate ways above (Equations A.1.1 and A.1.2):

p{ A1 ∩ (∼B2 )} ∪ {(~ A1) ∩ B2 } = pA1 ∩ (∼B2 ) + p(∼ A1) ∩ B2
= pA − pA pB + pB − pA pB
= pA + pB − 2 pA pB

The connection to Venn diagrams is shown below. In this exercise we will work
backward from the combination of outcomes we seek to the individual outcomes.
The probability we are after is for the cross-hatched area below.
{ A1 ∩ (∼ B2 )} ∪ {(∼ A1 ) ∩ B2 }

A1 B2

As indicated, the circles correspond to getting the outcome A in event 1 (left)
and outcome B in event 2. Even though the events are identical, the Venn
diagram is constructed so that there is some overlap between these two (which
we don’t want to include in our “or but not both” combination. As described
above, the two cross-hatched areas above don’t overlap, thus the probability of
their union is the simple sum of the two separate areas given below.

A1 ∩ ~B2
~ A1 ∩ B2

pA × p~B
p~A × pB
= pA (1 – pB)
= (1 – pA)pB

A1 ∩ ~B2 ~ A1 ∩ B2

Adding these two probabilities gives the full “or but not both” expression
above. The only thing remaining is to show that the probability of each of
the crescents is equal to the product of the probabilities as shown in the top
diagram. This will only be done for one of the two crescents, since the other
follows in an exactly analogous way. Focusing on the gray crescent above, it
represents the A outcomes of event 1 and not the B outcomes in event 2. Each
of these outcomes is shown below:

Event 1 Event 2

A1 ~B

p~B = 1 – pB
pA

A1 ~B2

K10030_Solution Manual.indd 2 10-07-201

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