A. Explain the structure of the DNA double helix, including nucleotides and the way in which they are bonded. B. Discuss the similarities and differences of DNA replication on the leading and lagging strands.

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Answer and Explanation:

a. The double helix structure begins with the formation of DNA strands. These tapes are formed by nucleotides that have nitrogenous bases called Adenine, Thymine, Cytosine and Guanine. Each strand has thousands of these nucleotides randomly attached. These nucleotides are capable of making connections between them, sending them together. These bonds are called hydrogen bonds and are established as follows: Adenine and thymine are capable of forming two hydrogen bonds, while cytosine and quanin are capable of forming three hydrogen bonds. Thus, to form the double helix, the nucleotides of one strand of DNA form hydrogen bonds with the nucleotides of the other strand of DNA.

b. The DNA strands are called the main fitsa and the delayed strand. The similarity between them is the structure formed by the same nucleotides. The main difference between them is noticed during DNA replication. While the main tape is replicated continuously, the delayed tape is not replicated continuously, due to Okazaki fragments.