we share 70% of are dna witha piece of grass, so is there anything we don’t share are dna with?

Question: we share 70% of are dna witha piece of grass, so is there anything we don't share are dna with?
- Keywords:
  DNA,
  grass,
  human,
  piece
Asked by furrysharpener to Ed, Katie, Sam, Steve, Vera on 15 Jun 2011.
- Sam Tazzyman answered on 14 Jun 2011:
  
  Good question – I don’t know for sure. Certainly lots of DNA is shared between species – this is strong evidence to show that all species are related through evolution. But maybe there are some viruses that don’t share any DNA with humans? It’s not clear whether to even class viruses as being alive: some scientists think of them as just being bits of chemical (DNA to be precise) that can get into living cells and turn the cells into little machines that make more copies of the original chemical. Viruses can’t reproduce alone, and so aren’t classified as being alive by some scientists.
- Steven Daly answered on 14 Jun 2011:
  
  That is indeed an interesting question. The reason we share so much DNA with other animals is that on the whole cells work in the same way, and most of DNA is for making cells do simple jobs like making energy which all cells have to do. I am unsure if there is anything we don’t share any DNA with, but I am sure that are certain genes which we do not share.
- Vera Weisbecker answered on 14 Jun 2011:
  
  Good question indeed! I think we do share DNA with absolutely everything alive (aside from Viruses als Sam said). I read that there are some really basic processes in the cell of all living organisms that are the same across the board, meaning that you have to have the same DNA sequences in order for these processes to function.
- Katie Marriott answered on 15 Jun 2011:
  
  That is a good question and i wouldn’t be able to answer it any better than the others have already have done!
- Ed Morrison answered on 15 Jun 2011:
  
  I think the answer is no, because all life on earth has (probably) descended from a common ancestor. This means your great-great-great-great….grand-parents were the same as all other living things today.
  
  I think that’s amazing!