Genetic Engineering - Cloning, DNA, Stem Cells Pros and Cons
Molecular genetics


The future technology

RNA is Single-Stranded

RNA is a polymer of nucleotides that's similar to DNA. The biggest difference between RNA and DNA is that RNA is a single stranded molecule while DNA is double stranded (a double helix).

Another difference is that RNA does not use thymine as a nucleotide base, instead, it uses a base called uracil. Uracil can form a base pair with adenine in RNA, just like thymine does in DNA. Here is a summary of the differences between RNA and DNA.

Characteristic DNA RNA
Structure double-stranded single-stranded
Bases Adenine, cytosine, guanine, thymine Adenine, cytosine, guanine, uracil
Sugar deoxyribose ribose

RNA Single-stranded Uracil, not Thymine

The fact that RNA is single stranded allows it to assume various unique shapes.

There is no second strand to lock it into a double helix shape. It can form base pairs with itself, and this allows it to fold up into many different three-dimensional shapes.

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