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Alisiya [41]
3 years ago
14

1. After examining the DNA of different organisms, which of the following did Erwin Chargaff conclude about the four bases?

Biology
1 answer:
siniylev [52]3 years ago
4 0

Answer: a). A = T and C = G.

Explanation: Erwin Chargaff's rule states that in a double-stranded DNA molecule, the number of adenine is equal to the number of thymine and the number of cytosine is equal to the number of guanine. This means that there is a ratio purine to pyrimidine in a double-stranded DNA molecule is 1:1.

There are four bases found in the DNA: adenine, thymine, guanine and cytosine and according to the Watson and Crick base pairing rule, adenine pairs with thymine while guanine pairs with cytosine. Adenine and guanine are the purine bases while thymine and cytosine are pyrimidine bases.

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In non-homologous end joining, the break ends are directly ligated together without the need for a homologous template unlike the homologous repair. this form of repair uses short homologous sequences of DNA termed microhomologies to direct repair and these microhomologies are seen as single-stranded overhangs found on the ends of double-strand breaks. When the overhangs are perfectly compatible, NHEJ ligates and repair the break. When these overhangs are not compatible, imprecise repair leading to deletion of nucleotides can also occur which is much more common .

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Explanation:

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