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why is it significant that different types of bacteria have a veriety of distinct photo-pigments?
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- What is G+C content of a bacteria? How it can be determined? Why it is not safe to assume that microorganisms with same G+C content belong to same species? How G+C content data is taxonomically valuable?Are you able to distinguish between specific species of bacteria? Why, or why not? Which method for identifying bacteria is more precise, morphology or DNA sequence analysis, and why?Why is E. coli O157:H7 an organism of concern in contaminated foods? The strain is represented as O157:H7. Which particular “parts” of the bacterial cell do the “O” and “H” refer to?
- Can the presence and absence of capsules in bacteria be used to identify unknown bacteria? YES OR NO? WHY?Why do many bacteria grow over a wide range of temperature?Most bacteria require a water activity of 0.9 or higher to grow. A prolonged period of being dry usually causes loss of viability. How were there still living bacteria in many of the dried foods such as dried rice, dehydrated coconut flakes, raisins, etc.? Discuss.
- Biofilms represent an important environmental niche. What processes regulate might regulate biofilm formation? Is quorum sensing involved and if so, how common is it? Why would biofilms promote the formation of genetic variants? What are the mechanisms by which this might occur?Different bacteria have evolved many different light-absorbing pigments. Why is this advantageous to bacteria in the environment (as opposed to if all bacteria used the same pigment)?The synthesis of arginine by Nuerospora was determined by examining a number of mutant strains that were unable to synthesize the compound. Use the table of bacterial growth below to 1) determine the correct sequence of the synthesis pathway and 2) where in the synthesis pathway each mutation interrupts the synthesis. A “+" indicates growth. Nothing added to Succinate Ornithine added Strain Cirtulline Arginine Added added added growth medium Wild Mutant 1 Mutant 2 Mutant 3 Mutant 4
- Is it proper to list genus in this way in the example sentence below?The potential identity of the unknown bacteria could belong to genus Proteus, genus Providencia, or genus Serratia.Does the word genus need to be capatilzed? Do you need to say the word genus before it?.What traits do green nonsulfur bacteria share withgreen sulfur bacteria and purple sulfur bacteria?There are five major clades of bacteria. List three of them and provide their general characteristics and at least one example for each group.