2006-08-20 13:53:49 · 4 answers · asked by nakia n 1 in Science & Mathematics ➔ Astronomy & Space
OK, no one has given a serious answer so...
just look at the structure of all these molecules and you will see why.
http://en.wikipedia.org/wiki/Base_pair#Hydrogen_bonding_and_stability
the oxygen and nitrogen have a slightly negative charge and the hydrogen have a slightly positive charge because the electrons spend less time with the hydrogen nucleus than the oxygen or nitrogen nuclei because the oxygen and nitrogen nuclei have more protons and a greater positive charge.
http://en.wikipedia.org/wiki/Astronomy
2006-08-20 15:06:53 · answer #1 · answered by warm soapy water 5 · 2⤊ 0⤋
DNA STRUCTURE: HYDROGEN BONDS ONLY OCCUR BETWEEN CERTAIN NUCLEOTIDE PAIRS: G AND C, AND A AND T.
IN NUCLEIC ACID, THE 5' END IS THE FRONT END, AND THE BACK END IS THE 3' END. SO THE TWO STRANDS ARE ORIENTED IN OPPOSITE DIRECTIONS.
JUST LIKE WITH POLYPEPTIDES, THERE IS A BACKBONE (IN DNA, MADE UP BY PHOSPHATE-SUGAR), AND SOMETHING STICKS OFF THE BACKBONE (THE NITOGENOUS "BASES" PART OF THE NUCLEOTIDE).
DNA CONSISTS OF TWO CHAINS OF NUCLEOTIDES KEPT TOGETHER BY HYDROGEN BONDS. AS WITH PROTEINS, WITHIN EACH NUCLEOTIDE CHAIN, THERE ARE STRONG BONDS TO KEEP THE MONOMERS TOGETHER. THE TWO STRANDS ARE IN A HELIX; SO DNA IS A "DOUBLE HELIX."
NUCLEOTIDES FOUND IN DNA ARE: A, T, C, G.
RNA IS A SINGLE STRAND OF NUCLEOTIDES. ONE MAJOR TYPE FUNCTIONS TO CARRY THE GENETIC INFORMATION FROM THE NUCLEUS TO THE CYTOPLASM. ALL RNA IS MADE FROM DNA.
NUCLEOTIDES FOUND IN RNA ARE: A, U, C, G (NOTE T IS SUBSTITUTED BY U).
2006-08-20 22:24:26 · answer #2 · answered by JFAD 5 · 0⤊ 0⤋
those guys who made the disgn
thought it would be usefull
2006-08-20 21:31:17 · answer #3 · answered by Anonymous · 0⤊ 1⤋
wrong category, and if you mean the four bases of our DNA ATCG, then.....i dont know.
2006-08-20 20:59:52 · answer #4 · answered by Man 5 · 0⤊ 1⤋