BIO1140 Lecture 20: BIO 1140 Lectures 19-20

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The type of bond holding the strands of dna together at the center are hydrogen bonds. Not covalent bonds because it would require a lot of energy to break these bonds for replication while hydrogen bonds are weak and it is easy to break them. Taking an xray beam and shooting at dna samples and looking at how the rays would defract. Got a picture of how the beam was diffracted according to the structure of dna. A have to face t and c have to face g. Only way it would fit with the measurements they have. In a dna nucleotide, the phosphate group attaches to the sugar (deoxyribose) at the 5" position, and the nitrogenous base (a,t,g, or c) attaches at the 1" position. New nucleotide is added at the 3" because there is a hydroxyl bond. Direction of elongation is 5" to 3". Both dna strands are built the same way.

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