Lesson 11 flex 8 week

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Grand Canyon University *

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205

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Biology

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Feb 20, 2024

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Lesson 11 Welcome to Lesson 11: Due Date Period 6 of BIO 205! Assignment : Please remember that all assignments are due early in the week but must be submitted no later than Saturday by 5pm of the due date period. You may submit work beginning Thursday, but no sooner. DUE: Due Date Period 6 Due date period 6 Thur-Sat Prokaryotes: Domains Bacteria and Archaea Classification of Bacteria-Lab Lesson 11: Read: Lesson 11 and Lab 8 online and Chapter 11 in your textbook MasteringMicrobiology Web Resource Library Lesson 11 Due Saturday 1) Lab 8 Last Day To Submit For Full Credit: 5:00 P.M. Saturday due date period 6 Lesson 11 You will need to read/study/learn lab 8 and chapter 11 in the textbook . MasteringMicrobiology Web Resource Library Lesson 11 Completing lesson 11 will also involve reading, studying, and learning the material and concepts covered in your online lesson and Chapter 11 in your textbook. You will also find it helpful to complete the pre- and post-evaluations to help gauge your learning. There is 1 assignment due this week:

1. Complete Lab 8. This week’s lab you will be indentifying organisms under the microscope, using culture media, biochemical tests and identifying unknown organisms using the same methods. Lesson Objectives: (These are the specific objectives that must be met, as outlined in the online lesson. Please focus on these, rather than purely on the chapter material because the exams are based off of these. In other words, the exam questions will test whether you meet and understand these particular points. Therefore, I cannot stress enough how important these are to your success in class.) By the end of the lesson, you should be able to: 1. Make a dichotomous key to distinguish among the a-proteobacteria described in this chapter. 2. Make a dichotomous key to distinguish among the b-proteobacteria described in this chapter. 3. Make a dichotomous key to distinguish among the orders of c-proteobacteria described in this chapter. 4. Make a dichotomous key to distinguish among the d-proteobacteria described in this chapter. 5. Make a dichotomous key to distinguish among the e-proteobacteria described in this chapter. 6. Make a dichotomous key to distinguish among the gram-negative nonproteobacteria bacteria described in this chapter. 7. Compare and contrast the green and purple photosynthetic bacteria with the cyanobacteria. 8. Make a dichotomous key to distinguish among the low G + C gram-positive bacteria described in this chapter. 9. Make a dichotomous key to distinguish among the high G + C gram-positive bacteria described in this chapter. Teaching Element: Prokaryotic Groups Bergey's Manual , as introduced in the last lesson, categorizes bacteria into taxa based on rRNA sequences. It lists identifying characteristics such as Gram stain reaction, cellular morphology, oxygen requirements, and nutritional properties. As mentioned in the introduction, prokaryotic organisms are classified into two domains: Archaea and Bacteria. We will cover the different phylum briefly. Make sure you go through the chapter in the text for a comprehensive review of the material. Domain Bacteria Bacteria are essential to life on Earth, as you've probably figured out by now. The following discussion emphasizes bacteria that are considered of practical importance, medical importance, or those that illustrate biologically unusual or interesting principles.

Domain Archaea Extreme halophiles, extreme thermophiles, and methanogens (as previously mentioned in the course) are included in the archaea. These are distinctive types of prokaryotic cells, and were discovered in the 1970s. The cell walls lack peptidoglycan, but share many of the same rRNA sequences. However, they were different from the Domain Bacteria or eukaryotic organisms. This group of organisms is highly diverse. To learn more about the Domain Archaea visit some of the supplemental websites provided in the web library linked at the bottom of this lesson. Microbial Diversity Few of the total number of different prokaryotes have been isolated and identified. Many cannot be cultivated with the media and conditions normally used for bacterial growth. Some are also part of complex food chains that cannot live and grow outside of the chain. PCR can be used to uncover the presence of bacteria that can't be cultured in the laboratory. Helpful Hints: When completing the lab assignment that you will be turning in, I would like to highlight the following reminders (these are some of the things that are the most often missed): 1. Express your answers in complete sentences 2. Provide thorough explanations and details so that I can see your depth of understanding. Lab 8: Classification of Bacteria: This laboratory exercise focuses on some of the medically important organisms. The information covered for each organism focuses on: Gram-stain, colony morphology on different types of media, biochemical tests, and correlation with diseases. 1. Identify microorganisms in the laboratory, emphasizing bacteria. 2. Utilize compound microscope to visualize microbial organisms. Lesson Objectives: (These are the specific objectives that must be met, as outlined in the online lesson. Please focus on these, rather than purely on the chapter material because the exams are based off of these. In other words, the exam questions will test whether you meet and understand these particular points. Therefore, I cannot stress enough how important these are to your success in class.) By the end of the lesson, you should be able to: 1. Identify organisms under the microscope.

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