I hav got 2 answers-yes &no from my 2 different teachers.Both hav provided explanations as below:
YES bcoz loops r formed only when complimentary Nitrogen base pairs are present.
NO bcoz It isn't necessary that complimentary bases are present in loops. I m totally confusd.PLZ ANSWER with proper EXPLANATION PLZ.
2007-03-23 17:57:34 · 4 answers · asked by Jigisha 2 in Science & Mathematics ➔ Biology
The answer is no. Most people picture DNA as a linear double helix with perfect basic pairing, which is not the case. This is even more true for tRNA and rRNa. tRNA is a transfer molecule used in the process of DNA assembly. In order to make the anti-codon on the tRNA more accessible, the tertiary structure has many folds, making a T shape with three arms: the D arm, the C arm (or anti-codon arm), and the T-pseudo-C arm. There is also an occasional lesser projecting arm called the variable loop. In order to form these curvy loops, there is a non-pairing segment at the end of each arm. Also, due to the 3' (read 3 prime) acceptor arm has an unpaired segment. These segments inevitably lead to a ratio other than 1:1 for purines and pyrimidines. While the ratio should work out to be close, an exact 1:1 is extremely improbable.
Also, the phenomenon of base-pair wobble will affect the ratio. In wobbling, instead of purine:pyrimidine or vice versa pairing, purines pair with purines and pyrimidines with pyrimidines. This small and often auto-corrected phenomenon will lead to cases in which the ratio is not 1:1. This is applicable to all forms of RNA and DNA.
2007-03-23 19:39:18 · answer #1 · answered by zmeister22 1 · 0⤊ 0⤋
It is because there is a complimentry pairins between 1 purine and other pyrimidine and also no.of purines is equal to pyrimidines(2:2).
2007-03-25 05:00:02 · answer #2 · answered by Somebody 2 · 0⤊ 0⤋
the termination sequence in mrna and t rna is followed by a repeated sequence of pyrimidine and purines which during translation help in the formation of secondary structure of RNA............
i think that is up to ur level if u wnna know more plz contact me.........
2007-03-31 19:35:43 · answer #3 · answered by sameer 1 · 0⤊ 0⤋
______first ans is good dna analysis is a better option
2007-03-29 07:37:40 · answer #4 · answered by xxsanxx 5 · 0⤊ 0⤋