BIOL 1020 Lecture 26: November 12th.docx

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1020
• Professor: J.Stacey

Document Summary

Key feature to the sugar phosphate backbone a sugar unit (deoxyribose) connecting one sugar to the next is that phosphate. The sugar units give us direction (3-5 prime end) Dna molecules have directionality to them (3-5 prime ends!) Dna molecule is a double stranded molecule. Thymine and cytosine only have a single ring, adenine and guanine have two rings. Many proteins work together in dna replication and repair: the relationship between structure and function is manifest in the double helix, watson and crick noted that the specific base pairing suggested a possible copying mechanism for genetic material. The basic principle: base pairing to a template strand: since the two strands of dna are complementary, each strand acts as a template for building a new strand in replication. In dna replication, the parent molecule unwinds, and two new daughter strands are built based on base-paring.