Polytene chromosomes of drosophila salivary glands

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35) Polytene chromosomes of Drosophila salivary glands each consist of multiple identical DNA strands that are aligned in parallel arrays. How could these arise? A) replication followed by mitosis B) replication without separation C) meiosis followed by mitosis D) fertilization by multiple sperm E) special association with histone proteins Answer: B Topic: Concept 16.2 Skill: Application/Analysis 36) To repair a thymine dimmer by nucleotide excision repair, in which order do the necessary enzymes act? 37) What is the function of DNA polymerase III? 10
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38) You briefly expose bacteria undergoing DNA replication to radioactively labeled nucleotides. When you centrifuge the DNA isolated from the bacteria, the DNA separates into two classes. One class of labeled DNA includes very large molecules (thousands or even millions of nucleotides long), and the other includes short stretches of DNA (several hundred to a few thousand nucleotides in length). These two classes of DNA probably represent 39) Which of the following removes the RNA nucleotides from the primer and adds equivalent DNA nucleotides to the 3' end of Okazaki fragments? A) helicase B) DNA polymerase III C) ligase D) DNA polymerase I E) primase Answer: D Topic: Concept 16.2 Skill: Knowledge/Comprehension 40) Which of the following separates the DNA strands during replication? 41) Which of the following covalently connects segments of DNA? 11
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