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  #1  
Old 11-18-2009
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DNA Single stranded DNA & Double Stranded RNA??

It initially confused me too much that how can a DNA molecule be single stranded and a RNA molecule be double stranded although I have seen all the text books explaining DNA as a double stranded molecule and RNA as single stranded molecule.
Despite the fact that I could not find the answer for this in most commonly used standard text books, I started to use my common sense, and I come to a conclusion that:
1- If a nucleic acid molecule has Thymine in its structure it must be called DNA. No matter it is double or single stranded.
2- If a nucleic acid molecule has Uracil in its structure it must be called RNA. No matter it is double or single stranded.

Please reply about my this idea as either correct or incorrect based on the a convincing reason. I shall be grateful to you!
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  #2  
Old 11-19-2009
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I don't think it's a good idea to try to understand every little detail in molecular biology.
Don't bother yourself about how a single stranded DNA or a double stranded RNA is made.
Focus on the high yield info, otherwise you will not finish Step 1 preparation in 10 years.
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  #3  
Old 11-19-2009
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Quote:
Originally Posted by Dr. N Elham View Post
It initially confused me too much that how can a DNA molecule be single stranded and a RNA molecule be double stranded although I have seen all the text books explaining DNA as a double stranded molecule and RNA as single stranded molecule.
Despite the fact that I could not find the answer for this in most commonly used standard text books, I started to use my common sense, and I come to a conclusion that:
1- If a nucleic acid molecule has Thymine in its structure it must be called DNA. No matter it is double or single stranded.
2- If a nucleic acid molecule has Uracil in its structure it must be called RNA. No matter it is double or single stranded.

Please reply about my this idea as either correct or incorrect based on the a convincing reason. I shall be grateful to you!

Your assumption that its called DNA or RNA based on the type of pyrimidic base they have is incorrect. The "R" in RNA stands for Ribose (pentose sugar) while the letter "D" in DNA stands for deoxyribose, which simply means that its deoxygenated on its Carbon 2'.
Cheers!
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Dr. N Elham (11-24-2009)
  #4  
Old 08-21-2011
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Cool tRNA

Quote:
Originally Posted by Dr. N Elham View Post
It initially confused me too much that how can a DNA molecule be single stranded and a RNA molecule be double stranded although I have seen all the text books explaining DNA as a double stranded molecule and RNA as single stranded molecule.
Despite the fact that I could not find the answer for this in most commonly used standard text books, I started to use my common sense, and I come to a conclusion that:
1- If a nucleic acid molecule has Thymine in its structure it must be called DNA. No matter it is double or single stranded.
2- If a nucleic acid molecule has Uracil in its structure it must be called RNA. No matter it is double or single stranded.

Please reply about my this idea as either correct or incorrect based on the a convincing reason. I shall be grateful to you!
hey dude, some of tRNA do contain T (thymine) so dont stick over ur concept.
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