Slide 1 / 7 New Jersey Center for Teaching and Learning Progressive Science Initiative This material is made freely available at www.njctl.org and is intended for the non-commercial use of students and teachers. These materials may not be used for any commercial purpose without the written permission of the owners. NJCTL maintains its website for the convenience of teachers who wish to make their work available to other teachers, participate in a virtual professional learning community, and/or provide access to course materials to parents, students and others. Click to go to website: www.njctl.org Slide 2 / 7 Prokaryotes & Viruses Free Response www.njctl.org Slide 3 / 7 1 Compare and contrast the lac and trp operons by responding to the following prompts: A Identify the lac operon and the trp operon as either an inducible operon or a repressible operon. B Identify which type of operon is typically on (inducible or repressible). C Identify which type of operon is usually off (inducible or repressible). Explain the steps that occur with a repressible operon (identify the factors or molecules that alter the typical state D of a repressible operon as well as the following terminology: co-repressor and operator)
Slide 4 / 7 2 The illustration below represents how antibiotic resistant can develop within a bacterial population. All of the circles represent a bacterial colony with varying level of antibiotic resistance. Explain this process by responding to the prompts below: Explain what occurs within the first circle, “Before A antibiotics” that leads to the results in the second circle, “After antibiotics”. Explain what happens within the second circle, “After antibiotics”, that leads to the third circle, “Final B population”. C Describe the final population of bacteria. Slide 5 / 7 3 The illustration below shows a type of virus that infects bacterial cells. A What is the name for this type of virus? B Label the parts of the virus shown on the illustration. Describe the sequence of events that occur within the lytic cycle from attachment of the virus to a bacterial cell C through the release of new viruses. Slide 6 / 7 4 There are four phases to bacterial growth, as shown in the graph below. http://www.smccd.edu/accounts/case/biol230/growth For each of the four phases labeled on the graph above, describe the following: A the activities of the bacterial cells B the state of the resources available to the bacteria
Slide 7 / 7 5 An experiment was performed to determine the effectiveness of various antibiotics on a particular species of bacteria. The plating results are shown below. http://loudoun.nvcc.edu/vetonline/vet132/micro/microbiology_unit_lesson5.htm Use the results shown on the image above in responding to the prompts below: A Two disks, C and E, have zones of inhibition. Explain what this result indicates and why these circles are clear. The bacteria cells surrounding disk A grew at a rapid rate once they were plated onto the agar. This area of the plate began with 100 bacterial cells. This species of bacteria B has a generation time of 60 minutes. The plates were placed into a 37oC incubator for 48 hours. When the plates were removed and viewed, approximately how many bacterial cells had grown around disk A?
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