ch06 - Chapter 6 Molecular Biology: What Is DNA and How...

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Chapter 6 Molecular Biology: What Is DNA and How Does It Work? 1. Which of the following would NOT be a role or property of the genetic material? a. It must be able to make copies of itself. b. It must encode information c. It must be able to control cells and tell them what to do. d. It must be low in molecular weight. e. It must be able to change by mutation. Ans: d 2. Which of the following structures is typical of the genetic material, DNA? a. cubicle helix b. triple helix c. double helix d. alpha helix e. c and d Ans: c 3. What DNA sequence would be complementary to the following DNA sequence: AATGCATCGGA? a. AATGCATCGGA b. TTACGTAGCCT c. UUACGUAGCCT d.AAUGCAUCGGA e. none of the other answers Ans. b 4. Who discovered the pairing rules of DNA? a. Watson b. Crick c. Franklin d. Chargaff 69
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Chapter 6 e. Wilkins Ans. d 5. What is the least stable form of RNA? a. mRNA b. tRNA c. rRNA d. pRNA e. all of them exhibit the same stability Ans: a 6. Which type of RNA possesses an anticodon? a. mRNA b. tRNA c. rRNA d. all of them have anticodons e. none of them have anticodons Ans: b 7. To what part of an mRNA is the anticodon of a tRNA complementary? a. the beginning b. the end c. the codon d. the anticodon e. the stop codon Ans: c 8. The following “ad” of positions for nucleic acids appeared in the paper HELP WANTED No experience necessary for this exciting entry-level position in the genetics industry. Hundreds of entry-level openings for tireless strands. Must be able to transcribe code in a nuclear environment and work closely with ribosomes. Engineer wanted who demonstrates skills in transporting and positioning the building 70
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Chapter 6 blocks of proteins. Executive – Limited number of positions for maintenance of genetic continuity through replication and control of cellular activity by regulation of enzyme production Driver -- all shifts. Must be able to follow exact instructions from double-stranded template. Travel from nucleus to the cytoplasm is required. Experience preferred. Applicants for the Driver position, could qualify if they were a. DNA b. mRNA c. tRNA d. rRNA e. an amino acid Ans: a 9. What is the name for a cluster of genes in a bacterium, including protein coding genes and all of the regulatory DNA involved in controlling their expression? a. operator b. repressor c. operon d. structural gene e. gene cluster Ans: c 10. A point mutation would be defined as a. failure of chromosomes to separate during meiosis b. DNA codon after one nucleotide base has been changed to another c. Transfer of alleles from one chromosome to another d. The presence of an extra chromosome e. Base deletion on the chromosome affecting subsequent bases Ans: b 11. A polyploid organism exhibits a. an extra chromosome b. one less chromosome than normal c. a decrease in chromosome sets d. one or more extra chromosome sets e. deletions in a single chromosome 71
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Chapter 6 Ans: d 12. A change in chromosome number involving only a single chromosome or single homologous
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ch06 - Chapter 6 Molecular Biology: What Is DNA and How...

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