DNA does not usually exist as a single strand, but instead as a pair of strands that are held tightly together. [9][12] These two long strands coil around each other, in the shape of a double helix.

Each DNA strand is a long chain, or polymer, constructed from repeating units called nucleotides. Every nucleotide is composed of three parts: a phosphate group, a five-carbon sugar …

2 days ago · DNA is made of two linked strands that wind around each other to resemble a twisted ladder — a shape known as a double helix. Each strand has a backbone made of …

In Watson and Crick’s famous double helix, each of the two strands contains DNA bases connected through covalent (phosphodiester) bonds to a sugar-phosphate backbone.

Dec 11, 2025 · Each strand of a DNA molecule is composed of a long chain of monomer nucleotides. The nucleotides of DNA consist of a deoxyribose sugar molecule to which is …

The two strands of DNA in a double helix are held together by pairing between the nitrogenous bases in the nucleotides of each strand. The nitrogenous base of a DNA nucleotide can be …

A DNA strand is defined as a polymer of nucleotides with a specific polarity, where one end is called the 5′-end and the other end is called the 3′-end.