yes it did.
Yes because they always paired thymine with adenine or always paired adenine with thymine, never pairing either with cytosine or guanine. Therefore they are in equal amounts.
Watson and Crickâ??s model explains that hydrogen bonds can only form between certain base pairs. Thymine can only bond with adenine and guanine can only bond with cytosine. This is why there are equal amounts of thymine and adenine in DNA.
yes it did.
yes it did.
Erwin Chargaff is his name
The Watson-Crick base pair of Thymine is Adenine. The two molecules are bound together by a set of three hydrogen bonds. Thymine can also form what are known as Thymine dimers when exposed to UV radiation, which is the source of damage to DNA from overexposure to UV radiation and can cause cancer.
Short answer: Adenine More information: In the model of DNA that was discovered by Rosalind Franklin, James Watson and Francis Crick in 1953 proposed that DNA was a double helix structure with 4 bases which pair to each other. Due to experiments that had been carried out by other scientists at the time (namely Erwin Chargoff in 1949) he showed that despite the amount of DNA present the amount of adenine was always equal to the amount of thymine and the amount of cytosine to the amount of guanine. When Watson had this information he suddenly realised that the adenine-thymine bond was the same length as the cytosine-guanine bond and therefore they would pair to each other in a double helix model. Thymine and adenine are held together by a double hydrogen bond; whereas cytosine and guanine form a triple hydrogen bond.
They are: - Adenine and thymine - Cytosine and guanine
Watson and Crick's model of DNA structure, the double helix, provided a physical explanation for Chargaff's rules by showing how the complementary base pairing of adenine-thymine and guanine-cytosine could fit within the double helix structure. This pairing resulted in equal amounts of A and T, and G and C, in a DNA molecule, which aligned with Chargaff's observation that the amounts of adenine and thymine, and guanine and cytosine, were nearly equal in DNA samples.
Those are Chargraff's Rules. You're wrong to think that adenine and thymine are the only pairs however because in RNA, adenine always pairs with uracil. Thymine is not in RNA. Adenine and Guanine are purines. Cytosine, thymine, and uracil are purimidines. Sources: My Science class and textbook Hope this helped!
Watson and Crick discovered that Adenine connects with Thymine and Guanine connects with Cytosine
Watson and Crick discovered that Adenine connects with Thymine and Guanine connects with Cytosine