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"Education is the most powerful weapon which you can use to change the world”
– Nelson Mandela

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Midterm 2

Midterm 2

Q Question 1 4 / 4 pts Statement on Academic Integrity Before starting the rest of the exam, please confirm the following by typing "I agree" in the blank provided. • An exam is but one assessment among many of student understanding of material and concepts covered in this course, and as such, must represent the actual work of only the individual student; • Everyone in the class is taking a different but comparable version of the exam, and the hard work everyone has put into this class is only fairly recognized if no one gains an unfair advantage by cheating, and therefore: • All work on this exam will be my own • I will not ask anyone for help on this exam • I will not talk with anyone about what was on this exam until the exam date has passed • I will not ask anyone else about what was on their exam until after the exam date has passed • During the exam, I will not access any external materials other than blank scratch paper to help me with this exam: no notes, texts, tutors, friends, web pages, etc. • I will be sure to take the entire exam in one sitting, I will not turn off my computer or otherwise deliberately exit out of my exam, and I will not attempt to make it look like I was interrupted during the course of the exam and forced to exit it • Other than the normal "looking off into space while thinking" that most of us do, I will maintain my focus on the computer screen and not regularly look off to the side in order to access outside resources • I will not use my cell phone or any other digital device (tablet, iPad, Apple Watch, etc.) for any reason during this exam, including but not limited to looking up information, looking up definitions, translating words into another language, etc. • I understand that if Honorlock catches me violating any of these requirements, my instructor will carefully review my circumstances, and if I am found to have cheated, I will receive a 0 on this exam and be reported to the College. Before proceeding with the rest of the exam, please demonstrate your agreement with this by typing "I agree" in the blank provided. Correct! Question 2 0 / 2 pts Consider a population of E. coli mutants that have a defect in their lacI gene, resulting in the production of a repressor protein that binds to the operator of the lac operon, but does not bind to lactose itself. If you placed these cells in a growth media containing lactose, what would happen? Question 3 0 / 2 pts Consider an E. coli cell that has a defect in the gene that produces the catabolite activator protein (CAP), making it unable to produce this protein. This cell would ______. Question 4 0 / 2 pts In bacteria, DNA binding proteins and alternative sigma factors play an important role in ______. Question 5 0 / 2 pts Pathogenic Streptococcus pneumoniae possess a polysaccharide capsule that prevents phagocytosis, allowing them to evade the immune system and multiple, causing pneumonia. S. pneumoniae that lack the capsule do not cause disease as they are readily destroyed by host phagocytes. When a mixture of living nonencapsulated and heat-killed encapsulated S. pneumoniae are injected into a mouse, the mouse dies, and living capsulated bacteria can subsequently be isolated from the mouse. Which of the following best explains this result?

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1.I Agree 2.Transcription of the lac operon would not occur. 3.not, or minimally, turn on transcription of the lac operon regardless of levels of glucose 4.gene expression 5.Living nonencapsulated bacteria acquired the genes for capsule formation from dead encapsulated bacteria via transformation.