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Biology

STRUCTURE OF DNA

STRUCTURE OF DNA What is structure of DNA? The structure of DNA was first explained in 1953 by Watson and Crick. DNA was shown to be a double helix that coils around itself. The two strands are parallel and the distance between the two is constant.   Components of DNA What are the components of DNA?  DNA is made up of repeating units called nucleotides. Each nucleotide is composed of: A five-carbon sugar (deoxyribose). Phosphate molecule. Nitrogenous base, four types are available i.e. Adenine – (A) Guanine – (G) Cytosine – (C) Thymine – (T) The bases are represented by their initials as A, G, C and T respectively. The sugar alternates with the phosphate, and the two form the backbone of the strands. The bases combine in a specific manner, such that Adenine pairs with Thymine and Guanine pairs with Cytosine. The bases are held together by hydrogen bonds.… Read More »STRUCTURE OF DNA

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