Unit 3: The Continuity of Life Movies  Videos  Study Guide

Chapter 12 DNA: The Genetic Material Review
  1. DNA is composed of monomers called .
     
     
     
     
  2. The physical structure of DNA is a double : two strands of polynucleotides twisted around each other.
     
     
     
     
  3. DNA involves these steps:
     
     
     
     
    • The enzyme unwinds the double helix, and lays down an RNA .
       
       
       
       
    • DNA adds nucleotides to each strand.
       
       
       
       
    • DNA joins the fragments together.
     
     
     
     
    Summary:
     
     
     
     
  4. A mutation is a change in the sequence, due to errors in DNA or to damage from physical or chemical agents called .
     
     
     
     
  5. Some genes can move from one place on the chromosome to another through transposition and result in either a gene or abnormal of the gene. 
     
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