8.2 Structure of DNA KEY CONCEPT DNA structure is the same in all organisms.

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8.2 Structure of DNA KEY CONCEPT DNA structure is the same in all organisms.

8.2 Structure of DNA DNA is composed of four types of nucleotides. DNA is made up of a long chain of nucleotides. DNA has a double helix structure and is very stable molecule Each nucleotide has three parts. –a phosphate group –a deoxyribose sugar –a nitrogen-containing base phosphate group deoxyribose (sugar) nitrogen-containing base

8.2 Structure of DNA The nitrogen containing bases are the only difference in the four nucleotides.

8.2 Structure of DNA T A C G Nucleotides always pair in the same way. The base-pairing rules show how nucleotides always pair up in DNA. Because a pyrimidine (single ring) pairs with a purine (double ring), the helix has a uniform width. – A pairs with T – C pairs with G

8.2 Structure of DNA The backbone is connected by covalent bonds. hydrogen bond covalent bond The bases are connected by hydrogen bonds.

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