why can't the DNA molecule itself perform the job mRNA perform in protein synthesis?
2007-12-02 13:11:29 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Biology
DNA is very stable, while RNA is labile. It may be easier to control protein synthesis by producing multiple copies of blue prints which self-destruct than using blue prints that last for ever.
2007-12-02 13:23:12 · answer #1 · answered by OKIM IM 7 · 0⤊ 0⤋
DNA encodes more proteins than a cell needs at any one point in time. Using mRNA copies of DNA for protein translation allows for greater control of gene expression (turning genes on/off) while allowing the gene to be passed down to the next generation. Alternate mRNA splicing (cutting out introns) also allows for multiple proteins to be created from one DNA sequence.
All organisms use this method (DNA->RNA->Protein), even those without a nucleus (prokaryotic cells).
2007-12-02 13:39:34 · answer #2 · answered by Lisa 3 · 0⤊ 0⤋
Protein synthesis happens in the cytoplasm of a cell. DNA never leaves the nucleus (except during division). mRNA is much smaller than DNA and can easily pass through the pores of the nucleic membrane.
2007-12-02 13:26:43 · answer #3 · answered by smarties 6 · 0⤊ 0⤋
attempt and think of of it this sort, you have your single DNA strand DNA: TAC CGG ATG CCA Now upload the RNA compliments to the DNA DNA: TAC CGG ATG CCA mRNA: AUG GCC UAC GGU So keep in mind your pairings for DNA A-T and C-G. they're compliments. Now in RNA the T is a U somewhat. So A-U and C-G. So now you have your mRNA strand mRNA: AUG GCC UAC GGU To make tRNA you upload the compliments to the mRNA. it is going to look precisely an analogous because of the fact the DNA strand different than the T's would be united statessomewhat mRNA: AUG GCC UAC GGU tRNA: UAC CGG AUG CCA So once you notice an A on the mRNA, you recognize the tRNA could have a U tournament as much as that. on the DNA strand it can be a T. the two mRNA and tRNA are the two RNA strands, they simply fluctuate of their function. desire this facilitates
2016-10-10 02:54:28 · answer #4 · answered by ? 4 · 0⤊ 0⤋
DNA does not encode proteins it does not have the codons to get the codons and transcript we need to translate into RNA which is what the ribozymes will recognize...not the DNA.
The ribozymes are made up of RNA and has some RNA helpers like rRNA and tRNA which need to recognize mRNA and will not work with DNA.
2007-12-02 13:17:40 · answer #5 · answered by Vee 5 · 0⤊ 0⤋