ANT 101 Lecture Notes - Lecture 6: Adenine, Cell Division, Dna Replication
Document Summary
2 chains of nucleotides in a double helix. The nucleotides are bonded together to form two strands in a ladder like structure with phosphate and sugar being the two sides of the ladder. They will only bond with their complementary base. These bonds create hydrogen bonds they hold the bases together and become the stepping pegs of the ladder. Hydrogen bonds are weaker and sometimes split apart. Helping creation of molecules that make up the organism. So when cells divide there can be a new copy of the dna in that cells. Dna normally exists as a chromatin in nucleus. Unduplicated cells look like a figure 8". Duplicated cells look like an x" fused in the center. We have pairs because you get one of each pair from each parent half from mother and half from father. Called autosomes each pair has the same structure. Humans have 22 pairs of autosomes, 1 pair of sex chromosomes.
