Structure of DNA and Nucleotides

Explain the structure of DNA and nucleotides. Include a model of your explanation.

DNA is shaped as a twisted ladder; a double helix. Hydrogen bonds connect corresponding nitrogenous bases with one another, forming the rungs of the ladder.

Mastering Biology | Pearson; Campbell Biology

Rosalind Franklin took a photograph of the X-ray diffraction of DNA. This photo is what helped Watson and Crick understand that DNA has a helical shape, and the width of this helix suggested that the molecule is made up of two strands. The width also provided a basis which allowed Watson was able to estimate the spacing of nitrogenous bases along DNA.

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Nucleotides are subunit of DNA that build up the twisted helical shape, each nucleotide consists of a sugar-phosphate group attached to a nitrogenous base.

Mastering Biology | Pearson; Campbell Biology