Download 16 MCQs on Biology I: Cellular Biology and Genetics with Answers | BIOL 201 and more Quizzes Biology in PDF only on Docsity! 1 Biology, 10e Raven, Johnson, Mason, Losos, Singer Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter 14 Questions Question 1 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 Question 4 Name the enzyme that links Okazaki fragments a. DNA polymerase I b. RNA primase c. DNA ligase d. Helicase e. ATP synthase Question 5 The Meselson-Stahl experiment demonstrated that DNA replication is a. Conservative b. Semi-conservative c. Disruptive d. Differentiated Question 6 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 Question 9 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 Question 10 Mutations can be caused by copying mistakes, and by exposure to chemicals or electromagnetic radiation. a. This is True b. This is False Question 11 If a strand of DNA had the sequence AGTCCA, which of the following would be the complementary DNA strand? a. CATGGT b. TCAGGT c. TCAAAU d. AGTCCA e. GGTTCA Question 14 Which of the following is a potential mutagen? a. UV light b. Chemicals c. Nicotine d. X-rays e. All of the above Question 15 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 Question 16 Mixing a killed virulent strain of bacteria and a living strain of benign 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
