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Why does adenine always pair with thymine and cytosine always pair with guanine when DNA is replicating?
Wiki User
∙ 11y ago
Adenine and thymine forms 2 hydrogen bonds, while guanine and cytosine forms 3 hydrogen bonds.
Adenine does not pair with guanine or cytosine because its pairing with thymine makes these 2 DNA bases stable.
Adenine does not fit very well with guanine and cytosine because they would prefer to bond with 3 hydrogen bonds.
Adenine and guanine are purines, which have two organic rings and thymine and cytosine are pyridines, which have one organic ring. In order for the nucleotides to fit only purines can pair with pyridines.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoThe usual pairing is T with A and C with G. "Always" is a strong word; errors in transcription can occur, though they're rare. Also, Adenine and Thymine form 2 hydrogen bonds, while Guanine and Cytosine form 3 hydrogen bonds. Guanine and Cytosine bond with 3 hydrogen bonds, and would prefer to bond with each other. Also when they bond, they make the 2 DNA bases stable. This also happens with Adenine and Thymine, but with 2 hydrogen bonds and 2 DNA bases stable.
Wiki User
∙ 14y agoThis principle is called Chargaff's rule. In double stranded DNA Thymine is always bound to Adenine while Cytosine is always bound with Guanine. Therefore the percentage of A will always equal the percentage of T and the percentage of G will always equal the percentage of C.
Take a hypothetical DNA molecule containing 20%T. This DNA will have 20%T, 20%A, 30%C and 30%G.
Wiki User
∙ 11y agoThat is the way the DNA is formed. If This occurrence is messed up the way a human is formed will drastically be changed. This is how many genetic diseases occur.
Because pairing takes place between purine and pyrimidine
Wiki User
∙ 9y agoThey tend to pair strongly that way because of the pattern of hydrogen bonds that they are capable of making with each other. However mistakes can happen and sometimes (less than once in a trillion pairings) it happens in a different way, which is one source of mutations.
Wiki User
∙ 11y agoBecause purine pairs with pyrimidine
Wiki User
∙ 13y agoYea man.
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What is the pairing arrangement of the nitrogen base?
the pairing is adanine with thymine and guanine with cytosine. the pairing is adanine with thymine and guanine with cytosine.
What bases are found in DNA?
Adenine, Thymine, Guanine, and Cytosine
What is the bases of the DNA?
DNA has four different bases. The bases of DNA are adenine, guanine, cytosine, and thymine. Thymine is the smaller pyrimidines and Guanine are the larger purines.
Thymine and cytosine?
Thymine and cytosine are examples of nucleobases found in DNA. Thymine is paired with adenine, while cytosine is paired with guanine.
What are the four nitrogen bases of DNA?
The four nitrogenous bases of DNA are adenine, thymine, guanine, and cytosine. Adenine bonds exclusively with thymine, and guanine exclusively with cytosine (excluding following exposure to damaging conditions).
What are the 4 different bases in DNA?
A-Adenine C-Cytosine T-thymine G-guanine
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 four nitrogen bases on DNA?
The four nitrogenouse bases found in DNA are adenine, thymine, cytosine, and guanine. When they are paired up it's always adenine to thymine, guanine to cytosine, thymine to adenine, and cytosine to guanine. They can't be mismatched such as adenine to guanine or cytosine
What are the 4 bases of the DNA ladder?
Adenine,Thymine,Guanine,and Cytosine. Adenine and thymine pair up and guanine and cytosine pair up.
What is the pairing arrangement of the nitrogen base?
the pairing is adanine with thymine and guanine with cytosine. the pairing is adanine with thymine and guanine with cytosine.
Can bind with guanine and adenine binds with?
guanine binds with cytosine in both RNA and DNA
What bases are found in DNA?
Adenine, Thymine, Guanine, and Cytosine
What are the four type of nitrogen bases?
Thymine Guanine Cytosine Adenine
What is the bases of the DNA?
DNA has four different bases. The bases of DNA are adenine, guanine, cytosine, and thymine. Thymine is the smaller pyrimidines and Guanine are the larger purines.
Thymine and cytosine?
Thymine and cytosine are examples of nucleobases found in DNA. Thymine is paired with adenine, while cytosine is paired with guanine.
What nitrogen base always pairs up with adenine?
adenine with thymine cytosine with guanine adenine with uracil cytosine with guanine
What nucleotide basis are present in equal amounts of DNA?
The nucleotide bases guanine and cytosine, and adenine and thymine are present in equal quantities in DNA. This is how scientists determined that guanine pairs with cytosine, and adenine pairs with thymine.
