BIOLOGY 11 – PRE-LAB EXERCISE Name: Answer Key 19 5 1. What is molecular genetics? What is biotechnology? The manipulation of DNA. 2. What is DNA replication? The process of copying a DNA molecule. When in the cell cycle does DNA replication occur? S Stage 3. What is the monomer of the DNA macromolecule called? nucleotide What are the three parts of the DNA monomer? Which part of the four different DNA monomers makes them different? the nitrogenous base 4. Examine Figure 19.1 in your Lab Manual . Describe the shape of a DNA molecule. twisted ladder (double helix) What part(s) of the DNA monomer make up the “sides” of the ladder? sugar-phosphate backbone What part(s) of the DNA monomer make up the “rungs” of the ladder? complementary pairs of nitrogenous bases the four nitrogenous bases
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