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| 3166719613 | The enzyme that synthesizes the new DNA strand during replication is: a) DNA polymerase I b) DNA polymerase III c) RNA primase d) DNA ligase e) Cholinesterase | b) DNA polymerase III | 0 | |
| 3166729247 | What is the function of the enzyme gyrase? a) Starts DNA replication b) Stabilizes the single strands c) Adds the primer d) Relieves the torque from rapid untwisting e) None of the above | d) Relieves the torque from rapid untwisting | 1 | |
| 3166738406 | Where are the Okazaki fragments found? a) On the lagging strand b) On the leading strand c) At the replication origin d) In the cytoplasm e) On both strands | a) On the lagging strand | 2 | |
| 3166745608 | Name the enzyme that links Okazaki fragments: a) DNA polymerase I b) RNA primase c) DNA ligase d) Helicase e) ATP synthase | c) DNA ligase | 3 | |
| 3166754643 | The Meselson-Stahl experiment demonstrated that DNA replication is: a) Conservative b) Semi-conservative c) Disruptive d) Differentiated | b) Semi-conservative | 4 | |
| 3166764900 | During DNA replication, what enzyme is responsible for untwisting the DNA helix? a) DNA polymerase I b) RNA primase c) DNA ligase d) DNA polymerase III e) Helicase | e) Helicase | 5 | |
| 3166773809 | Chargaff's rule states that: a) DNA strands are in antiparallel alignment b) G matches with C, and T matches with A c) The DNA molecule is a double helix d) DNA transformation occurs when an organism incorporates DNA from the environment | b) G matches with C, and T matches with A | 6 | |
| 3166777638 | Phosphdiester bonds link the 5' of one nucleotide to the 3' of the next nucleotide via the phosphate group. This bond is a strong covalent bond. a) True b) False | a) True | 7 | |
| 3166796027 | Why does replication proceed in opposite directions on the leading and lagging strands? a) The polymerase enzyme needs a primer b) DNA polymerase III can only add to the 3' end of a strand c) The Okazaki fragments are only on the leading strands d) The parent strands are oriented in the same direction e) Helicase only allows for replication of one strand at a time | b) DNA polymerase III can only add to the 3' end of a strand | 8 | |
| 3166803955 | Mutations can be caused by copying mistakes, and by exposure to chemicals or electromagnetic radiation. a) This is true b) This is false | a) True | 9 | |
| 3166819310 | If a strand of DNA had the sequence 3'AGTCCA5' which of the following would be the complementary DNA strand? a) 5'CATGGT3' b) 3'TCAGGT5' c) 3'TCAAAU5' d) 5'AGTCCA3' e) 5'TCAGGT3' | e) 5'TCAGGT3' | 10 | |
| 3166829327 | If a DNA molecule contains 40% thymine, how much guanine will it contain? a) 10% b) 20% c) 30% d) 40% | a) 10% | 11 | |
| 3166844083 | The enzyme telomerase attaches the last few bases on the lagging strand. As cells age, telomerase activity drops. What would happen to the chromosomes in the absence of telomerase activity? a) Chromosome replication would be terminated b) Okazaki fragments would not be linked together c) Chromosomes would shorten during each division d) The leading strand would become the lagging strand e) The cells would become cancerous | c) Chromosomes would shorten during each division | 12 | |
| 3166852505 | Which of the following is a potential mutagen? a) UV light b) Chemicals c) Nicotine d) X-rays e) All of the above | e) All of the above | 13 | |
| 3166866170 | What would be the immediate consequence of a non-functional primase enzyme? a) The strands would break due to the torsional strain from rapid untwisting b) The helix could be opened c) The DNA polymerase III enzyme would have nothing to bind to d) The Okazaki fragments would not be linked together e) The single DNA strands could not be held open | c) The DNA polymerase III enzyme would have nothing to bind to | 14 | |
| 3166880345 | Mixing a killed virulent strain of bacteria and a living strain of bacteria together produces virulent bacteria. What does this demonstrate? a) Genes are inactivated when a cell dies b) DNA can only be passed on during reproduction c) Cells can pick up genes from the environment d) All bacteria are virulent e) None of the above | c) Cells can pick up genes from the environment | 15 |
