BSC 283 Chapter Notes -Staphylococcus Epidermidis, Microorganism, Protozoa

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stephanie-coleman

18 Oct 2022

School

USM, Southern Miss

Department

BSC - Biological Sciences

Course

BSC 283

Professor

Cynthia Littlejohn

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Document Summary

Microbe: a living organism that requires a microscope to be seen. Although algae (a type of microbe) can be seen without a microscope. Each microbe contains its own genome and therefore has the ability to reproduce. Microbes are classified as a species: organized by genes and traits. Microbes are organized by their genetic characteristics and the presence or absence of a membrane enclosed nucleus. Microbes with a membrane enclosed nucleus are called eukaryotes. Microbes without a membrane enclosed nucleus are called prokaryotes. Usually single celled: an ameba is an example of a protozoa; amebas can be free- living or parasitic. Protozoa and algae together are called protists . Grow by absorbing nutrients from their surroundings. Can grow as single cells (yeast) or as filaments (bread mold) or complex structures (mushrooms) Bacteria: prokaryotic cells, can grow as single cells. Filaments, or as communities with simple differentiated forms. Bacteria is found in every habitat of our biosphere.

Related Questions

Please explain

As most microbes reproduce asexually, "speciesâ are defined by differences in their DNA sequences. When the genome of soil microbe A is analyzed, long stretches of genes from multiple species of other soil microbial species are discovered. This indicates that:

A) microbe A engulfed other soil microbes and acquired their genes.

B) there is transfer of genes from other soil microbe species.

C) due to the universal DNA code common genes will be found in different species.

D) microbes are closest to the universal ancestor therefore there are common genes.

1) A paragraph of an explanation of what is microbe, providing specific examples of each type of microbe. a) a comparison of the cell structure and organization of microbes c) the types of habitats occupied by microbes d) how each kind of microbe interacts with the human body- in both a positive and negative way

1. Give two methods you would use to determine if bacteria have flagella.

2. McConkey agar plates are used to isolate enteric bacteria. It contains bile salts and crystal violet which inhibits the growth of Gram (+) bacteria. The plate also contains lactose and a neutral red pH indicator in order to detect fermentation. Plates were grown at 37Â°C. (Note: if you choose to answer this question you must answer both part A and B)

A.) What component(s) make the media selective? What component(s) makes it differential?

B.) You inoculate the plate with E. coli, Serratia marcescens, and Staphylococcus epidermidis. E. coli and Serratia marcescens grew, but no growth occurred with the Staphylococcus epidermidis. The E. coli appeared pink in color instead of its usual white and the Serratia was white. What does this tell you about each bacteria?

3. You observe a bacterium with a spirochete morphology. What type of flagella does this microbe have? How do spirochete flagella differ from peritrichous flagella in location and how it moves the microbe?

4. List three structures of the Gram negative cell envelope and their function.

BSC 283 Chapter Notes -Staphylococcus Epidermidis, Microorganism, Protozoa

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