Quick RNA question

[JFK90787]

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Just want clarification on this: do tRNA and rRNA also contain uracil instead of thymine?

 

[coffeebythelake]

Just want clarification on this: do tRNA and rRNA also contain uracil instead of thymine?

yes. tRNA contains a bunch of other weird nucleotides like Pseudouridine

 

[BestDoctorEver]

Just want clarification on this: do tRNA and rRNA also contain uracil instead of thymine?

Uracil is what make RNAs molecule different from DNA. All RNAs molecule contain uracil instead of thymine which is a part of DNA... Remember that for DNA... AT( Adenine-Thymine connected by 2 hydrogen bonds), and GC (Guanine and Cytosine connected by 3 hydrogen bonds) to make the double helix.

 

[wanderer]

double post

 

[wanderer]

If I remember correctly uracil is more easily made than thymine. It was also widely present before thymine was. So it would make sense for all kinds of nucleic acids other than DNA to have uracil. DNA has thymine because it allows for the proofreading of cytosine (which can be deaminated and form uracil). Because RNAs are all temporary, there isn't much of a need for a proofreading mechanism for them and hence no need for incorporation of thymine.

 

[BestDoctorEver]

If I remember correctly uracil is more easily made than thymine. It was also widely present before thymine was. So it would make sense for all kinds of nucleic acids other than DNA to have uracil. DNA has thymine because it allows for the proofreading of cytosine (which can be deaminated and form uracil). Because RNAs are all temporary, there isn't much of a need for a proofreading mechanism for them and hence no need for incorporation of thymine.

That was an intricate answer....but your are right though.