from DNA to MRNA, thymine does not exist and uracil takes on the role of thymine, with it's base pair adenine. what i want to know is that from MRNA to TRNA, is adenine's complementary base pair still uracil or is it thymine??
2007-10-09 04:45:59 · 4 answers · asked by amelia l 1 in Science & Mathematics ➔ Biology
T(DNA)---U(mRNA)---A(tRNA))
2007-10-13 02:02:04 · answer #1 · answered by Ishan26 7 · 0⤊ 0⤋
It's really quite simple. In normal biological systems, you find thymine on any DNA and uracil on any RNA. From DNA to mRNA you find thymine does exist on the DNA, but you get uracil on the mRNA. On mRNA and tRNA you get uracil.
Don't confuse yourself with intermediate states that don't exist.
2007-10-09 05:04:51 · answer #2 · answered by yutgoyun 6 · 0⤊ 0⤋
All types of RNA contain no Thymine, only Uracil.
So A in a mRNA codon binds to U in a tRNA anticodon.
2007-10-09 05:01:13 · answer #3 · answered by gribbling 7 · 0⤊ 0⤋
yes U always replaces T in RNA, whether it be mRNA or tRNA.
one side note: tRNA is produced off the DNA template. tRNA is not produced off an mRNA template. A mature mRNA (hnRNA) has introns spliced out, is tranported out of the nucleus, and is ready to take care of business at the ribosomes. mRNA doesn't have the means to encode tRNAs because many of the tRNA genes are "non protein-coding" and therefore non even present in the mature mRNA.
2007-10-09 06:06:11 · answer #4 · answered by GUIDO 4 · 0⤊ 0⤋