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Chapter 9: DNA

DNA- The Genetic Material

TermDefinition
Double helix the shape of the DNA molecule (Watson and Crick)
Nucleotide a piece of the DNA molecule, made of a phosphate, a sugar and a base
Base- pairing rules A pairs with T (2 bonds) and G pairs with C (3 bonds)
Complementary base pair the sequence of bases on one strand, or side, determines the sequence of the bases on the other strand, or side
Purines 2, or double, ring bases (A and G)
Pyrimidines 1, or single, ring bases (T and C)
Adenine (A) always pairs with T, 2 bonds
Thymine (T) always pairs with A, 2 bonds
Cytosine (C) always pairs with G, 3 bonds
Guanine (G) always pairs with C, 3 bonds
DNA replication making a copy of DNA so the cell can reproduce, during Synthesis phase
DNA helicase the chemical that opens the double helix by breaking the bonds between the bases on the opposite strands
replication fork the areas where the double helix separates
DNA polymerase the chemical that moves along the DNA strands and adds nucleotides according to the base-pairing rules
Created by: jyoung271
 

 



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