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chapt06 - Chapter 6-DNA How The Molecules of Heredity...

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Chapter 6—DNA: How The Molecules of Heredity Carries, Replicates, and Recombines Information Fill in the Blank 1. The full chemical name of DNA is _________________. Ans: deoxyribonucleic acid Difficulty: 2 2. The protein, ________, is needed to lay down a segment of RNA complementary to the DNA before replication can begin. Ans: primase Difficulty: 2 3. An origin of replication generally has _______ (how many?) replication forks. Ans: two Difficulty: 2 4. The discontinuous lagging strand on a replication fork consists of _________ fragments that are later ligated together to form one strand of DNA. Ans: Okazaki Difficulty: 2 5. The E. coli chromosome contains _____ (how many?) origin(s) of replication? Ans: one Difficulty: 3 6. A prokaryote lacks a __________ membrane. Ans: nuclear Difficulty: 2 7. Recombination is probably always initiated by _______ of DNA. Ans: nicking Difficulty: 3 8. The _________ strand is synthesized continuously during DNA replication. Ans: leading Difficulty: 2 9. A _____________ enzyme recognizes a specific DNA sequence and is able to cleave the DNA generating either “blunt” or “sticky” ends of the DNA. Ans: restriction Difficulty: 1 10. A virus that infects bacterial cells is called a _____________. Ans: bacteriophage Page 90
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Difficulty: 2 11. The genetic material of some viruses such as X174 and M13 is ____________. Ans: single-stranded DNA Difficulty: 3 12. The genetic material of the viruses that cause polio and AIDS is ________. Ans: RNA Difficulty: 3 13. Topoisomerase _________ supercoils by nicking the DNA. Ans: relaxes Difficulty: 2 14. In E. coli , recombination begins at _____ sites where recBCD nicks and displaces a strand. Ans: chi Difficulty: 2 Multiple Choice 15. Which of the following is not true of DNA? A) It is acidic. B) It contains deoxyribose. C) It is found in cell nuclei. D) It contains phosphate. E) It contains proteins. Ans: E Difficulty: 2 16. The molecule of heredity is: Page 91
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17. The four subunits which compose DNA are called: 18. DNA is localized mainly in the: 19. Each nucleotide of DNA is made up of: A) a deoxyribose sugar. B) a nitrogenous base. C) a phosphate. D) a and b only. E) all of the above Ans: E Difficulty: 2 20. The polarity of DNA synthesis is:
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