Sage-Tips

Which RNA nucleotide is complementary to thymine?

uracil
either of the nucleotide bases linked by a hydrogen bond on opposite strands of DNA or double-stranded RNA: guanine is the complementary base of cytosine, and adenine is the complementary base of thymine in DNA and of uracil in RNA.

What is the complementary base for thymine?

Each nucleotide base can hydrogen-bond with a specific partner base in a process known as complementary base pairing: Cytosine forms three hydrogen bonds with guanine, and adenine forms two hydrogen bonds with thymine.

Which mRNA nucleotide is complementary to?

mRNA → DNA For converting a sequence from mRNA to the original DNA code, apply the rules of complementary base pairing: Cytosine (C) is replaced with Guanine (G) – and vice versa. Uracil (U) is replaced by Adenine (A) Adenine (A) is replaced by Thymine (T)

Why does adenine pair with thymine?

Base pairing between adenine and thymine can be found in DNA only. There are two hydrogen bonds holding the two nitrogenous bases together. One of the hydrogen bonds is formed between one of the Hydrogen atoms of the amino group at C-6 of adenine and the Oxygen atom of the keto group at C-4 of thymine.

Why does RNA use uracil instead of thymine?

Uracil is energetically less expensive to produce than thymine, which may account for its use in RNA. In DNA, however, uracil is readily produced by chemical degradation of cytosine, so having thymine as the normal base makes detection and repair of such incipient mutations more efficient.

Which Mrna nucleotide is complementary to adenine?

In RNA, however, a base called uracil (U) replaces thymine (T) as the complementary nucleotide to adenine (Figure 3).

Which example of complementary base pairing is correct?

Correct answer: Guanine and cytosine are bound together by three hydrogen bonds; whereas, adenine and thymine are bound together by two hydrogen bonds. This is known as complementary base pairing. In RNA, the nucleotide thymine is replaced by the nucleotide uracil.

Does uracil pair with thymine?

Properties. In RNA, uracil base-pairs with adenine and replaces thymine during DNA transcription. Methylation of uracil produces thymine.

Does uracil replace thymine?

Uracil is a nucleotide, much like adenine, guanine, thymine, and cytosine, which are the building blocks of DNA, except uracil replaces thymine in RNA. So uracil is the nucleotide that is found almost exclusively in RNA.

How is uracil different from thymine?

What is the difference between Thymine and Uracil? DNA molecules contain thymine, whereas RNA contain uracil. Thymine contains a methyl (CH3) group at number-5 carbon, whereas uracil contains hydrogen (H) molecule at number-5 carbon. In all biological systems, thymine is mainly synthesized from uracil.

What is the complementary DNA and RNA base sequence?

The RNA base sequence is complementary to the DNA’s coding sequence from which it has been copied. However, in RNA, the base T is absent and U is present instead. If the DNA strand has a sequence AATTGCGC, the sequence of the complementary RNA is UUAACGCG.

Why does DNA have thymine instead of uracil?

I think there are several factors, and its important to remember that RNA came to be before DNA, so I think its rather “why does DNA have thymine instead of uracil”. It is energetically less costly to make uracil rather than thymine, and since RNA gets degraded after a while it’s better.

What are the monomers of DNA and RNA?

DNA and RNA are comprised of monomers that scientists call nucleotides. The nucleotides combine with each other to form a polynucleotide, DNA or RNA. Three components comprise each nucleotide: a nitrogenous base, a pentose (five-carbon) sugar, and a phosphate group ( Figure ).

What are the rules of base pairing between DNA and RNA?

This means that the base-pairing rules between a DNA molecule and an RNA molecule are: An enzyme called RNA polymerase proceeds along the DNA template adding nucleotides by base pairing with the DNA template in a manner similar to DNA replication.