I'm not quite sure what you mean by this, but the letters of DNA are A (Adenine), T (Thymine), C (Cytostine), and G (guanine). You may be thinking of how T is replaced by U (Uracell) in RNA code.
A T C G
(Adenine, thymine, cytosine, guanine)
S is a letter that is not in the gentic code of DNA
A+
"U" for uracil; found only in RNA.
S
letter a
g
B is not present. The nitrogen bases of DNA have letters A, C, G, T to represent it.
a single ring structure
Absolutely not.Proteins have an amine-carboxyl backbone with any of 20 possible side groups.Nucleic acids a sugar-phosphate backbone with only 4 possible side groups, called bases.
Nitrogen bases in DNA
g
The nitrogen bases of DNA have letters A, C, G, T to represent it. B is absent in DNA
B
The bases are: Adenine[A] Guanine[G] Cytosine[C] Thymine[T]
The four bases found in DNA are:adenine (A)cytosine (C)guanine (G)thymine (T).
B is not present. The nitrogen bases of DNA have letters A, C, G, T to represent it.
The pH of bases is over 7.
a single ring structure
on the structure,size,species.
Bases are repestented by values greater than 7 on the pH scale.
Absolutely not.Proteins have an amine-carboxyl backbone with any of 20 possible side groups.Nucleic acids a sugar-phosphate backbone with only 4 possible side groups, called bases.
I think file is a open structure. and the data base is closed structure.