As you have learned in Modules 1 and 2, prokaryotes share many common features that differentiate them from eukaryotes, such as:
Lack of nuclear membrane, unicellularity, division by binary-fission and generally small size.
As introduced on the Home page of Module 3, various species differ and can be classified into taxonomic groups based on several characteristics. One characteristic commonly used to differentiate an organism as belonging to one species or another is the potential for the individuals to reproduce sexually and produce viable offspring. However, this characteristic cannot be applied to prokaryotes, and so their identification and classification is often determined based on:
All microbial metabolisms can be arranged according to three principles:
1. How the organism obtains carbon for synthesizing cell mass:
2. How the organism obtains reducing equivalents used either in energy conservation or in biosynthetic reactions:
3. How the organism obtains energy for living and growing:
In practice, these terms are almost freely combined. Typical examples are as follows:
For example: Cyanobacteria are photosynthetic autotrophs. Cyanobacteria split water, H2O, molecules and use the electrons to reduce carbon in photosynthesis. Water is the electron donor. However, Chlorobiaceae and Chromatiaceae are also photosynthetic autotrophs, but they use hydrogen sulfide H2S as the electron donor, or reducing equivalent donor.
For this SLP assignment, you will continue to analyze the paper by Urakawa et al. (2012) by considering the characteristics that allow us to classify the prokaryotic organisms in this study as belonging to different Domains. You will use the website: http://www.ucmp.berkeley.edu/exhibit/phylogeny.html
UC Berkeley’s virtual exhibit hall and resource on taxonomy and phylogeny, to complete this assignment.
Review your definitions of Archaea and ammonia-oxidizing bacteria from Module 1. Begin at http://www.ucmp.berkeley.edu/exhibit/phylogeny.html, webpage titled “Welcome to the Phylogeny Wing. Select the link “Phylogeny of Life” within the first of the “four ways to get started.” You will an overview of the relationship between DNA and the Three Domains of Life. Use this page to begin the research necessary to address these topics in a 3-4 page paper:
The Session Long Project consists of an integrative project emphasizing the personalized application of each module’s concepts. For Modules 1–5, students are required to engage in an original integrative project reflecting their comprehensive knowledge of and ability to apply the course materials. Each component of the SLP will be graded on a modular basis.
Your essay is considered a scholarly work. You will be provided with many scholarly references to begin each assignment. For any additional research you are required to do to complete your assignment, please use scholarly references such as a peer reviewed journal article or a government sponsored or university sponsored website. As you read through your sources, take notes from your sources and then write your paper in your own words, describing what you have learned from your research. Direct quotes should be limited and must be designated by quotation marks. Paraphrased ideas must give credit to the original author, for example (Murray, 2014). Direct copying from “homework help” websites will not receive credit.
When you write your essay, please organize your paper to include an introduction (overview of the assignment), body with subtitles (reflecting the requirements of the assignment), and a summary (develop connections between the required topics).
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