What is the difference between DNA and RNA?

DNA is a double helix, made up of two polynucleotide strands.  RNA is comprised of only one polynucleotide strand.  

The sugar in the sugar-phosphate backbone of DNA is deoxyribose, whereas ribose is present in RNA.  

Both DNA and RNA contain the bases adenine, guanine and cytosine.  In DNA, adenine pairs with thymine, but in RNA it pairs with uracil.  

DNA is more stable than RNA.  

CB

Related Biology A Level answers

All answers ▸

What is meant by the primary structure of a protein and why is it so important?


Why do mutations makes it difficult to create a vaccine ? (4 marks - has the potential to be worth more in an exam)


What evidence proves that the Y chromosome determines maleness?


Explain the role of inorganic ions in the body.