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What is the complementary base pair of thymine in RNA?

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Sarah Oconnell

Published Feb 20, 2026

What is the complementary base pair of thymine in RNA?

Three of the four nitrogenous bases that make up RNA — adenine (A), cytosine (C), and guanine (G) — are also found in DNA. In RNA, however, a base called uracil (U) replaces thymine (T) as the complementary nucleotide to adenine (Figure 3).

Also, what is the complementary base for thymine?

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.

Furthermore, what are the RNA RNA rules of complementary base pairing? In DNA/RNA base pairing, adenine (A) pairs with uracil (U), and cytosine (C) pairs with guanine (G). The conversion of DNA to mRNA occurs when an RNA polymerase makes a complementary mRNA copy of a DNA “template” sequence.

Also question is, what does thymine pair with in RNA?

In RNA, however, a base called uracil (U) replaces thymine (T) as the complementary nucleotide to adenine (Figure 3). When this base-pairing happens, RNA uses uracil (yellow) instead of thymine to pair with adenine (green) in the DNA template below.

What is the complementary strand of RNA?

Complementary RNA (cRNA) is a copy of a strand of RNA that will bind to the appropriate region of the original molecule. If the original RNA stand had a base sequence of AUU, for example, the sequence of the cRNA strand would be UAA.

What is the complementary strand?

Complementary Definition (Biology)

So, for example, the complement of guanine is cytosine because that's the base that would pair with guanine; the complement of cytosine is guanine. This is true along the entire DNA strand, which is why the two strands of DNA are called complementary strands.

Which of the following is showing complementary base pairing?

Complementary base pairing is the phenomenon where in DNA guanine always hydrogen bonds to cytosine and adenine always binds to thymine. The bond between guanine and cytosine shares three hydrogen bonds compared to the A-T bond which always shares two hydrogen bonds.

What is the law of complementary base pairing?

Chargaff's rule, also known as the complementary base pairing rule, states that DNA base pairs are always adenine with thymine (A-T) and cytosine with guanine (C-G). A purine always pairs with a pyrimidine and vice versa.

What do you mean by complementary base pairing?

”'complementary base pairing. The standard arrangement of bases in nucleotides in relation to their opposite pairing, such as thymine being paired with adenine and cytosine paired with guanine.

What are complementary nitrogenous bases?

DNA and RNA base pair complementarity
Nucleic AcidNucleobasesBase complement
DNAadenine(A), thymine(T), guanine(G), cytosine(C)A=T, G≡C
RNAadenine(A), uracil(U), guanine(G), cytosine(C)A=U, G≡C

What bases pair together in RNA?

The four bases that make up this code are adenine (A), thymine (T), guanine (G) and cytosine (C). Bases pair off together in a double helix structure, these pairs being A and T, and C and G. RNA doesn't contain thymine bases, replacing them with uracil bases (U), which pair to adenine1.

What does T pair with in mRNA?

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)

What are the 3 RNA types?

Of the many types of RNA, the three most well-known and most commonly studied are messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA), which are present in all organisms.

What are 4 base pairs of DNA?

These chemical bonds act like rungs in a ladder and help hold the two strands of DNA together. There are four nucleotides, or bases, in DNA: adenine (A), cytosine (C), guanine (G), and thymine (T). These bases form specific pairs (A with T, and G with C).

Why does RNA use U instead of T?

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.

What does thymine pair with in DNA?

Thymine is one of the building blocks of DNA. And in the double helix, thymine pairs with adenine, or the A nucleotide.

How many base pairs are in RNA?

four nitrogenous bases

What are the base pairing rules for RNA quizlet?

The base pairing rule is that adenine always is with thymine and guanine always bonds to cytosine.

What base is found only in RNA?

Uracil
The rules of base pairing explain the phenomenon that whatever the amount of adenine (A) in the DNA of an organism, the amount of thymine (T) is the same (called Chargaff's rule). Similarly, whatever the amount of guanine (G), the amount of cytosine (C) is the same.

What is the rule of RNA?

RNA is a unique polymer. Like DNA, it can bind with great specificity to either DNA or another RNA through complementary base pairing. It can also bind specific proteins or small molecules, and, remarkably, RNA can catalyze chemical reactions, including joining amino acids to make proteins.

How are base pairs formed?

Base pairs are found in double-stranded DNA and RNA, where the bonds between them connect the two strands, making the double-stranded structures possible. Base pairs themselves are formed from bases, which are complementary nitrogen-rich organic compounds known as purines or pyrimidines.

What does a pair with in DNA?

In DNA, the code letters are A, T, G, and C, which stand for the chemicals adenine, thymine, guanine, and cytosine, respectively. In base pairing, adenine always pairs with thymine, and guanine always pairs with cytosine.

Is RNA a protein?

A central tenet of molecular biology states that the flow of genetic information in a cell is from DNA through RNA to proteins: “DNA makes RNA makes protein”.

What is complementary mean?

: completing something else or making it better : serving as a complement. —used of two things when each adds something to the other or helps to make the other better. : going together well : working well together.

What is a complementary sequence?

Complementary sequence: Nucleic acid sequence of bases that can form a double- stranded structure by matching base pairs. For example, the complementary sequence to C-A-T-G (where each letter stands for one of the bases in DNA) is G-T-A-C.

How does the cell make RNA?

RNA is synthesized from DNA by an enzyme known as RNA polymerase during a process called transcription. The new RNA sequences are complementary to their DNA template, rather than being identical copies of the template. RNA is then translated into proteins by structures called ribosomes.

Why are DNA strands complementary?

The nitrogen bases can only pair in a certain way: A pairing with T and C pairing with G. Due to the base pairing, the DNA strands are complementary to each other, run in opposite directions, and are called antiparallel strands.
During the process of transcription, the information stored in a gene's DNA is passed to a similar molecule called RNA (ribonucleic acid) in the cell nucleus. A type of RNA called transfer RNA (tRNA) assembles the protein, one amino acid at a time.

What is the mRNA Strand?

Messenger RNA (mRNA) is a subtype of RNA. During the transcription process, a single strand of DNA is decoded by RNA polymerase, and mRNA is synthesized. Physically, mRNA is a strand of nucleotides known as ribonucleic acid, and is single-stranded.

What is complementary DNA?

Complementary DNA (cDNA) is a DNA copy of a messenger RNA (mRNA) molecule produced by reverse transcriptase, a DNA polymerase that can use either DNA or RNA as a template. From: Encyclopedia of Genetics, 2001.

What is the template for the RNA sequence?

RNA polymerase uses one of the DNA strands (the template strand) as a template to make a new, complementary RNA molecule. Transcription ends in a process called termination.

What is the complementary strand of DNA for 5 Aggtccg 3?

The if given the base sequence for one strand: 5'-AGGTCCG-3', the complimentary strand must have the sequence: 3'-TCCAGGC-5'. This ensures that A only pairs with T, and C only pairs with G.

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