There is junk DNA or non-coding DNA. This DNA is the segment before the promoter of a different gene.
Junk DNA is non-coding DNA it does not code for protein.
junk DNA
You are 98% junk.
DNA which doesn't carry the information to make proteins. Originally thought to be "junk", but people are finding that it does have functions.
They are called non-coding DNA. It was called "junk DNA" at one time by people doing research on DNA because they didn't think these DNA codes had any use. Now they know that they have uses and so have stopped using that name "junk DNA".
The nucleus, but telomeres protect DNA by adding junk DNA to the ends that way the exons do not get messed with. The 5' Cap and the Poly-A Tail are the two ends of the DNA with junk DNA, or introns.
If we didn't have junk DNA any mutation would cause damage to essential sequences of DNA and likely kill the host. It would be to dangerous to be in the sun because uv radiation cause mutations. However most of the mutation occur in the non essentioal junk DNA thus protecting essential DNA.
The conservation of "junk DNA" sequences in diverse genomes suggests that they have important functions.
"Junk" DNA isn't just junk. It also contains inactive genetic code. For example, we still have genetic code for a prehensile tail in our DNA. Rarely, this becomes activated in humans today which results in a vestigial tail.In the junk DNA we find all sorts of interesting correlations between species that gives a greater depth of knowledge about where we came from.
Junk DNA
Junk DNA gene
Junk DNA