The building blocks of dna are nucleotides, which are made up of three parts: a deoxyribose (5 carbon sugar), a phosphate group, and a nitrogenous base . there are four types of nitrogenous bases in dna. adenine (a) and guanine (g) are double ringed purines, and cytosine (c) and thymine (t) are smaller, single ringed pyrimidines. Dna structure and function. dna is the information molecule. it stores instructions for making other large molecules, called proteins. these instructions are stored inside each of your cells, distributed among 46 long structures called chromosomes. these chromosomes are made up of thousands of shorter segments of dna, called genes.
The building blocks of dna are nucleotides, which are made up of three parts: a deoxyribose (5 carbon sugar), a phosphate group, and a nitrogenous base (figure 9.1.2 9.1. 2 ). there are four types of nitrogenous bases in dna. adenine (a) and guanine (g) are double ringed purines, and cytosine (c) and thymine (t) are smaller, single ringed. A nucleoside is a base linked to a sugar. a nucleotide is a nucleoside with one or more phosphate groups. (b) a dna strand containing four nucleotides with the nitrogenous bases thymine (t), cytosine (c), adenine (a) and guanine (g) respectively. the 3′ carbon of one nucleotide is linked to the 5′ carbon of the next via a phosphodiester bond. Each nucleotide in dna contains one of four possible nitrogenous bases: adenine (a), guanine (g) cytosine (c), and thymine (t). adenine and guanine are purines, meaning that their structures contain two fused carbon nitrogen rings. cytosine and thymine, in contrast, are pyrimidines and have a single carbon nitrogen ring. Dna (deoxyribose nucleic acid), discovered in 1869 by friedrich miescher, is composed of four bases (guanine, cytosine, adenine, thymine). the bases are connected to a sugar (deoxyribose), and sugars are interconnected through phosphate linkages to form a long, unbranched chain. for much of the first half of the 20th century, the chemical agent.
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