2/21 free write- Bio lab report intro

Antibiotics are chemicals that act to kill or inhibit living organisms (book). Microbes in the soil produce anitbiotics to compete for resources for survival (class). These soil microbe bacteria are commonly known as actinomycetes. Actinomycetes are typically off white, rod shaped and filamentous. The antibiotics these Actinomycetes produce kill or inhibit living organisms and work by mainly targeting gram positive bacteria. Gram positive bacteria are weaker and only have one thick cell wall, and therefore have a low selectivity. On the other hand, bacteria that have a cell wall covered by an extra membrane are protected from antibiotics. Protected bacteria are gram negative and have a higher selectivity.
Selectivity is very important in regards to antibiotics and treatment of illness because only certain antibiotics kill specific types of bacterium. For example, as said before, gram negative bacteria had a higher selectivity, and therefore one type could not inhibit it but another type of antibiotic erythromycin can effectively kill both gram positive and negative bacteria
In this experiment we have isolated two types of mystery bacteria on separate dishes. After a week of allowing the bacteria to grow, we will introduce the two bacteria. Our hypothesis suggests that the purple stand of bacteria will kill the white strand. If a zone of inhibition forms around the site where the purple bacteria is formed, the hypothesis that the purple bacteria produces antibiotics against the other strand will be supported.


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