To analyse: With the help of figure 2.26 why adenine forms hydrogen bonds only with thymine and cytosine only with guanine. Introduction: DNA (deoxyribonucleic acid) a kind of nucleic acid that is present in all cells and many viruses. It is the hereditary molecule that passes on genetic code from one generation to the next by duplication. DNA is a polynucleotide and each nucleotide has three structural components- A pentose sugar (deoxyribose), phosphate group and nitrogen bases (adenine, guanine, thymine or cytosine). The backbone of DNA is made of sugar alternating with phosphate and the nitrogen bases branch out. DNA acquires a double helical shape because of hydrogen bonding between nitrogen bases.

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Chapter 2.L2, Problem 7CT

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To analyse:

With the help of figure 2.26 why adenine forms hydrogen bonds only with thymine and cytosine only with guanine.

Introduction:

DNA (deoxyribonucleic acid) a kind of nucleic acid that is present in all cells and many viruses. It is the hereditary molecule that passes on genetic code from one generation to the next by duplication. DNA is a polynucleotide and each nucleotide has three structural components- A pentose sugar (deoxyribose), phosphate group and nitrogen bases (adenine, guanine, thymine or cytosine). The backbone of DNA is made of sugar alternating with phosphate and the nitrogen bases branch out. DNA acquires a double helical shape because of hydrogen bonding between nitrogen bases.

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