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thyamine isn't present in mRNA its place is taken by uracil

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Q: Which purine or pyrimidine bases are not present in the messanger RNA m-RNA is it adenine or guanine or cytosine or thymine or uracil?
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What are the purine bases and pyrimidine bases?

They are the nitrogen bases that are attached to RNA and DNA. In DNA, adenine and guanine are purines and thymine and cytosine are pyrimidines. In RNA, thymine is replaced by pyrimidine uracil.

What are the three pyrimidine bases?

There are 2 groups of nitrogen bases. These are Pyrimidine and Purine. In the Purine group, there are Adenine and Guanine, In the Pyrimidine group, there are Cytosine, Thymine(replaced by Uracil in RNA).

Two nitrogenous bases known as purines are?

adenine, and guanine are purines Cytosine and thymine are pyrimidines. by:mj

How are four bases paired in a molecule DNA?


Which nucleotide are purines and which are pyrimidine?

Thymine and Cytosine are the pyrimidine nucleotides of DNA, while Adenine and Guanine are the purine structures.

Name the four nitrogen bases?

There are 4 nitrogenous bases found in DNA; Cytosine, Adenine, Guanine, and Thymine. Cytosine pairs with Guanine, and Thymine pairs with Adenine. *In RNA, Uracil replaces Thymine, therefore Adenine pairs with Uracil, in RNA.*

What are the bases of a DNA molecule?

Adenine, Thymine, Cytosine, and Guanine. Adenine pairs with Thymine (A-T), and Cytosine pairs with Guanine (C-G). In an RNA molecule, Thymine is replaced by Uracil, so it would be Adenine and Uracil (A-U) and Cytosine and Guanine (C-G).

What are the elements of a nitrogenous base?

A basic compound that contains nitrogen, such as a purine or pyrimidine. A basic compound that contains nitrogen, such as a purine or pyrimidine.

What are the complimentary base paring?

The rules for base parings in DNA and RNA, are rather simple purines pair with pyrimidines; adenine pairs with thymine and guanine pairs with cytosine In all cases, purines pair with pyrimidines Specifically in DNA, adenine (a purine) pairs with thymine (a pyrimidine) and Guanine (a purine) pairs with cytosine (a pyrimidine) While in RNA, the same simple rules apply, the only difference being uracil replaces thymine adenine (a purine) pairs with uracil (a pyrimidine) and Guanine (a purine pairs with cytosine (a pyrimidine)

Why are guanine and cytosine and they and adenine useful in the DNA molecules?

Guanine is a purine and Cytosine is a pyrimidine. They are nucleotides that pair together. The two are useful in DNA molecules because they pair together, along with Adenine and Thymine, which build a double helix. Guanine, Adenine, Thymine, and Cytosine are all nitrogenous bases.

What are the 4 different bases in DNA?

A-Adenine C-Cytosine T-thymine G-guanine

Does Complementary base pairing always pairs a purine with a pyrimidine?

Yes. Adenine+Guanine, or Cytosine+Thymine; each is a pyrimidine/purine pair.