Question

is gene double helix? does each gene correspond to specific protain? is d.n.a ANTIPARALEL double helix? does informative r.n.a take information from only one helix from gene for making protein? if the answer of each question is YES, then it turns out that one gene corresponds to 2 totally different protein, depending from which helix informative r.n.a takes information. so what is the mistake in my discution?

Answer 1

only one strand of the DNA is coding. mRNA is transcribed from this coding strand and so a protein is derived from this strand. However because of base pairing in DNA the other strand is exactly the same as the coding one but in the other direction, it is there purely to provide a secure method of DNA replication, so no, only one protein comes from each gene. However different genes can be derived from the same section of DNA by alternative splicing. Different sections of the mRNA can be spliced out to make a different code and therefore a different protein.

Answer 2

DNA is a double helix, a gene is just a stretch of nucleotide bases which code for a protein,during transcription only one strand is read (the coding strand).The other strand just gives support to DNA and makes it more stable(thanks to the hydrogen bonds).It was nature's way of overcoming the unstable nature of RNA.And one gene cannot correspond to two protiens, but different genes can correspond to one protien.