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bio assessment 1-C

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Western University
Biology 1001A
Tom Haffie

Assessment 1 Table of Contents Time Remaining: 0:00:38 Part 1 of 14 - Administration This exercise allows 35 minutes for 14 questions. Most questions have a straightforward structure with a single correct answer for full marks. However, there are two types of questions in which more that one answer may be correct: Type 1 questions are structured as was shown in Lecture 8 with 5 possible combinations of correct answers to choose from (A – 1, 2, & 3; B – 1 & 3; C – 2 & 4 etc.). Type 2 questions may have more than one correct answer and you must pick all correct answers to get full marks. Part marks are available but there is a penalty for choosing incorrect answers. (e.g. Two correct + one incorrect = 0.5 marks.) These questions will be clearly indicated. Question 1 of 14 1.0 Points The anti-retroviral drug AZT is effective in treating people newly diagnosed with HIV. However, after HIV patients have used AZT for several months, the virus becomes resistant. How would this scenario (evolution of AZT-resistance) differ if the patient did NOT take AZT? 1. The mutation conferring AZT-resistance would be less likely to occur. 2. The mutation conferring AZT-resistance could still occur, but it would not outcompete AZT-susceptible forms. 4. The virus would be unlikely to increase in AZT-resistance.volution of AZT-resistance would be slower. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3 and 4 are correct Reset Selection Part 2 of 14 - Question 2 of 14 1.0 Points Why is HIV considered a “retrovirus”? A. Unlike most viruses, it was first discovered in the 1980s. B. Unlike most viruses, it can evolve towards higher OR lower drug-resistance. C. Unlike most viruses, its genetic information flows from proteins to RNA to DNA. D. Unlike most viruses, its genetic information is encoded by RNA that must then be reverse-transcribed to DNA. Reset Selection Part 3 of 14 - Question 3 of 14 1.0 Points The Miller–Urey experiment was a huge breakthrough in our understanding of the origins of life. What was major conclusion of this experiment? A. That proteins can be synthesized without ribosomes. B. That biological molecules can be formed without energy. C. That the synthesis of biological molecules does not require water. D. That amino acids can be synthesized in the absence of life. Reset Selection Part 4 of 14 - Question 4 of 14 1.0 Points Which of the following statements, about the evolution of information transfer, is correct? 1. Modern human cells contain ribozymes. 2. RNA is more prone to degradation than DNA because the base uracil contains oxygen at the 2 position while thymine does not. 4. The occurrence of ribonucleoproteins (e.g. telomerase) suggests that proteins were the last of the "big three" major biological polymers to evolve (ie. protein, DNA, RNA). A. 1, 2 & 3 only B. 1 & 3 only C. 2 and 4 only D. 4 only E. All of 1, 2, 3 & 4 are correct Reset Selection Part 5 of 14 - Question 5 of 14 1.0 Points By the time of the end-Cretaceous mass extinction 65 million years ago, which of the following groups had ALREADY diverged (split off) from the lineage that eventually led to humans? 1. Plants 2. Marsupials 3. Protostomes 4. Gibbons A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3 and 4 are correct Reset Selection Part 6 of 14 - d Question 6 of 14 1.0 Points Which of the following statements are supported by the attached evolutionary tree? 1. Archaea are more closely related to Eukarya than to Bacteria. 2. LUCA was the first living thing. 3. The most recent common ancestor for Bacteria and Archaea was LUCA. 4. Bacteria are more closely related to Archaea than to Eukarya. A. 1, 2 and 3
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