Base pairs Data – all had Temp = 250C PH = 7 Binding Constant A & X [A] = 0.00373221M [X] = 0.00373221M [AX] = 0.0462678M 3.322 C & X [C] = 0.0469007M [X] = 0.0469007M [CX] = 0.00309935M 1.409 T & X [T] = 0.0452279M [X] = 0.0452279M [TX] = 0.00477212M 2.333 G & X [G] = 0.0469554M [X] = 0.0469554M [GX] = 0.00304456M

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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Question: Which base (A, C, T or G) corresponds to X in the unknown?

I did the experiment, got the data below, and calculated the binding constants.  But I am TOTALLY lost as to how to figure this out! I don't even know what steps I would take.  

Base pairs

Data – all had

Temp = 250C PH = 7

Binding Constant

A & X

[A] = 0.00373221M

[X] = 0.00373221M

[AX] = 0.0462678M

3.322

C & X

[C] = 0.0469007M

[X] = 0.0469007M

[CX] = 0.00309935M

1.409

T & X

[T] = 0.0452279M

[X] = 0.0452279M

[TX] = 0.00477212M

2.333

G & X

[G] = 0.0469554M

[X] = 0.0469554M

[GX] = 0.00304456M

2.633

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Follow-up Question

What if all the data above was the same EXCEPT with the change of G & X?  Their new data is below.  Would base X still be T?

G & X

[G] = 0.0447315M

[X] = 0.0447315M

[GX] = 0.0026845M

1.3416

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