A el > B AG 34 rate,5 L.aj What is the potential expressed, as a free energy cha

Question

A el > B AG 34 rate,5 L.aj What is the potential expressed, as a free energy change for the formaticn of D given Asee the diagram above.The omect number is a hcde numer hat includes a sign or til dilierent from 0 1.b What is the rate cf E formation given A. the corrct answer is a cositive whole numberwwithcut ai+ orsign. 1cjChocse all that apply that ere ccnsistent with the characteristics of NAD cofaccrs. 2. NACH transfers electrcns an oxidized aibstrate b. Reactions that icrm NADH raisethe elular ccncentrationof NADH have no effert on the cellukar concentraticn of NAD+ C. NAD+ is an arreptor cf high eneryy electrcn d. a substrate that receives high energy electrons is cidized 1d.iChocse all the fcllowing that are characteristic of adenine nucleotide ccfactars a. Reacion that form ADP lowerthe ccnentraticn cf adsnine nucleotide in the cell b. ADP is fcmed from ATP in a hydrolysis reaction C ATPis a high energy phosphate acceptor d. Recions that fcm ATP raise the concantration of high energy phoschate carries in the cell Lej Given A in the pathway above,which final products above accumulate? B,c, and cd have equilibrium signs a.No aamultion because A is no umed t.Only E accumulates ?. ?, ?, D ccumulate in equal concentration Only D accumulats

Explanation / Answer

Ans. 1 a)

Free energy change for the formation of D given A will be the sum of free energy changes all the steps that finally lead to the formation of D.

So, free energy change for the formation of D given A = -34 + 0 + 0 = -34

Ans. 1 b)

The rate of E formation given A is 1, as the slowest is the rate determining step and the conversion of D to E is the slowest step os all.

Ans. 1 c)

Option a and c are consistent with the characteristics of the NADH cofactors as NADH transfers electrons to an oxidized substrates (for example in electron transport chain) and NAD+ is an acceptor of high energy electrons (for example in krebs cycle).

however option b and d are not consistent with the characteristics of the NADH cofactors as reactions that raise the cellular concentration of NADH lead to depletion of NAD+ pool. and a substrate which receives high energy electrons is not oxidized but reduced.

Ans.1 e)

B,C,D will accumulate in equal concentrations as interconversion of B to C and C to D have delta G equals to zero.

E does not accumulate as it has very low rate.

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