What is the structure of a DNA double helix?

Double helix is the description of the structure of a DNA molecule. A DNA molecule consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating groups of sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases: adenine (A), cytosine (C),…

How are the two strands of DNA held together?

The two strands are held together by bonds between the bases, adenine forming a base pair with thymine, and cytosine forming a base pair with guanine. A double helix has become the icon for many, many kinds of discussions about where science has been and where it’s going.

What is the description of the structure of DNA molecule?

Double Helix Double helix is the description of the structure of a DNA molecule. A DNA molecule consists of two strands that wind around each other like a twisted ladder.

What are the building blocks of DNA made up of?

These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating. The four types of nitrogen bases found in nucleotides are: adenine (A), thymine (T), guanine (G) and cytosine (C).

Why are there complementary bases in the double helix?

Complementary base pairs in the DNA double helix. The shapes and chemical structure of the bases allow hydrogen bonds to form efficiently only between A and T and between G and C, where atoms that are able to form hydrogen bonds (see Panel 2-3, pp. 114–115) (more…)

What is the structure of DNA called?

Double helix is the biological term that describes the overall structure of DNA. Its double helix consists of two spiral chains of DNA. This double helix shape is often visualized as a spiral staircase.

What is the bond formed between the two strands of DNA?

Formed between the Nitrogenous Bases of the two strands of DNA. In the above picture, the two strands of DNA are shown. One strand is from 5′ to 3′ (DNA Strand 1) and the other strand is from 3′ to 5′ (DNA Strand 2). A= Adenine, G= Guanine, C= Cytosine, T= Thymine. The bond formed between D→P→D is Phospho-diester Bond.