practice test 2

practice test 2 - 1. Which of the following events occur...

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1. Which of the following events occur within a DNA replication bubble? a. DNA helicase unwinds the double helix at each replication fork within a replication bubble 2. To what does the phrase “ladder-like appearance” refer when considering the structure of DNA? a. The complementary base pairs as rungs and the sugar-phosphate backbone as the rails 3. Mutations are changes in the… a. Base pairing rules for DNA 4. Why did many scientists have trouble believing that DNA could be the carrier of genetic information? a. DNA has only four nucleotides, which seemed too few to encode the vast array of hereditary traits of organisms 5. How do nucleotides pair according to Chargaff’s rule? a. Thymine-adenine/guanine-cytosine 6. How can a cell, killed by heat in order to render it harmless, somehow still act to transform a second strain of bacterium from a noninfectious form into a disease carries (i.e. a pathogen)? a.
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practice test 2 - 1. Which of the following events occur...

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