Question

What is the double-helical structure of DNA?

Answer 1

DNA

1. The full form of DNA is deoxyribose nucleic acid.
2. It is a double helical structure composed of nucleotides.
3. It carries genetic information from one generation to another.
4. Watson and Crick discovered the structure of DNA.

Double-helical Structure of DNA

1. The two strands of DNA double helix are composed of nucleotides.
2. A sugar, phosphate group, and nitrogenous base make up each nucleotide.
3. The backbone of the DNA double helix is made up of sugar and phosphate groups.
4. The nitrogenous bases are found in the DNA double helix's center.
5. The four different nitrogenous bases found in DNA are adenine, guanine, cytosine, and thymine.
6. Based on the structure of the nitrogenous base, they are categorized into purines (Adenine and Guanine) and pyrimidines (Cytosine and Thymine)
7. The nitrogenous base of one nucleotide is hydrogen-bonded with the complementary nitrogenous base of the other strand.
8. Two hydrogen bonds connect adenine and thymine, while three bonds connect guanine and cytosine.