2007-05-21 15:55:44 · 3 answers · asked by alisha 1 in Science & Mathematics ➔ Medicine
In the grand scheme of things? Or on a cellular level?
In the grand scheme of things, it seems that DNA (or at least RNA) was around before proteins. There are RNA sequences that can catalyze their own replication. These likely evolved into DNA which eventually coded proteins. In fact, the amino acid in proteins that is almost always at the heart of the catalysis, histidine, is structurally related to RNA.
On a cellular level, it is indeed a chicken-egg problem. DNA encodes proteins, but proteins help replicate DNA.
2007-05-21 17:56:44 · answer #1 · answered by jellybeanchick 7 · 1⤊ 0⤋
*chuckle* chicken or the egg??....80)
That is what it sums up to be; it is kinda hard to not have one before the other. In order to have protein synthesis you have to have DNA via mRNA,tRNA, and rRNA; and to have DNA you have to have protein synthesis.......
2007-05-22 01:45:45 · answer #2 · answered by no_einstein 4 · 0⤊ 0⤋
I will answer yours, if you answer mine.
Chicken or the egg first ?
2007-05-21 23:01:38 · answer #3 · answered by kenneth h 6 · 0⤊ 0⤋