Base pairs ratio in double-stranded DNA

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dmitrip
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Base pairs ratio in double-stranded DNA

Post by dmitrip » Tue Jan 04, 2011 2:51 pm

Hey guys/gals this is my first post here and I would appreciate any help with this question I got:)

It states in my textbook: Which of the following statements are true about double-stranded DNA?

a) A +C = T + G
b)A + G= C + T
c)A + T= G + C
d) A/G = C/T
e) A/G = T/C
f) (C + A)/(G + T) =1

Initially I went with e) since I remember something about Chargaff's experiment but I am not sure and would be very great full if somebody could confirm my answer and explain why this one and not the others!

Thank you very much in advance.

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JackBean
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Post by JackBean » Tue Jan 04, 2011 3:01 pm

well, yes, e should be correct, but that makes correct as well a and b (these are equivalent) and f is equivalent of f :roll: :(
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Darby
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Post by Darby » Wed Jan 05, 2011 1:01 am

The amounts of A and T should be equal, same for C and G.

If you called the A or T amount X and the C or G amount Y, the answers become -

a) X + Y = X + Y
b) X + Y = Y + X
c) X + X= Y + Y
d) X/Y = Y/X
e) X/Y = X/Y
f) (Y + X)/(Y + X) =1

You can see, several answers are right.

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JackBean
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Post by JackBean » Wed Jan 05, 2011 7:46 am

good, I was affraid, I have mistake somewhere :)
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canalon
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Re:

Post by canalon » Thu Jan 06, 2011 2:26 am

JackBean wrote:good, I was affraid, I have mistake somewhere :)

You might:
and f is equivalent of f :roll: :(

At least that was not very helpful or illuminating :)
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

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JackBean
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Post by JackBean » Thu Jan 06, 2011 4:52 pm

I see. Someone is really reading my posts :lol:

Anyway, it should be "f is equivalent of a" ;)
http://www.biolib.cz/en/main/

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