2. Important Molecules (30 points total a) Name the following compounds (10 poin

Question

2. Important Molecules (30 points total a) Name the following compounds (10 points, each compound worth 2 points, standard abbreviations are finc.) b) Which one(s) is (arc) NOT a commonly used clectron carriers (2 points) c) Which one(s) can only do two-electron chemistry (2 points)? d) Which one(s) can only do one clectron chemistry (2 points)? c) Which one(s) can do both one and two-electron chemistry (2 points)? 0 Which one(s) are usually involved in a "dehydrogenase" (2 points)? 0 0 OH OH le 0-P-0 { PIN g) What is the "oxidation state" for the carbon in HCOOH (2 points)? h) What is a hydride (2 points)? i) The standard redox potential for the following half reactions are shown below: H2O, Eo)-0.8 16 V NADH, E"--0.324 V 402 + 2H+ + 2e + + 2e Calculate the standard free energy change for the following reaction (6 points): NAD+HO H2O NADH + H+ +1 /2 O2

Explanation / Answer

Biochemistry

(a) Names of the compounds are already mentioned

A : FMN

B : Haeme

C : RMN

D : CoQ

E : NAD+

(b) Haeme is not a commonly used electron carrier

(c) NAD+ can only do a two-electron chemistry

(d) Haeme can only do a one-electron chemistry

(e) CoQ can do both one electron and two electron chemistry

(f) NAD+ is onvolved in dehydrogenase

(g) oxidation state for C is +2 in HCOOH

(h) hydride is a hydrogen with an extra hydrogen on it, that is hydrogen with an negative charge.

(i) standard free energy dGo

Eo = -0.324 - 0.816 = -1.14 V

dGo = -nFEo

F = Faraday constant

n = 2

So,

dGo = -2 x 96500 x -1.14 = 220.02 kJ

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