Base pair question

[Dentstu]

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Which of following base pairs promotes helix stabilization in DNA but not so in RNA ?

1. G C
2. A T
3. G U
4. C T
5. A U

Please anwser and explain.

 

[BUSODM]

Which of following base pairs promotes helix stabilization in DNA but not so in RNA ?

1. G C
correct me if i am wrong

 

[docdk]

actually in DNA , A-T G-C
but in RNA , T is replaced by U,ie A-U G-C
the ans should b 2. AT but not sure abt choice 4.CT

plzz correct m...

 

[slovak27]

A T

Final answer...end of thread

 

[docdk]

gr8 !! liked ur confidence.....

 

[slovak27]

DentSTU

I would like to appologize for my previous obrupt answer as I did not fully read your question...you wanted an explanation so here it goes:

Q.
1. G C
2. A T
3. G U
4. C T
5. A U

#1 this pairing occurs in both DNA and RNA...therefore not the answer to the question

#2 CORRECT answer because A=T ( "=" meaning 2 H-bonds) in DNA, however A=U in RNA

#3 G only binds C (3 H bonds) in both RNA and DNA

#4 same explanation as #3

#5 A=U doesnt occur in DNA

if you want me to rephrase this or other questions..feel free to msg me