Exercise#6 Title: Exercise Date: 01/31/2018 Expectation (purpose): DUE: Wednesda

Question

Exercise#6 Title: Exercise Date: 01/31/2018 Expectation (purpose): DUE: Wednesday, February 7, 2018 List: equipment/rools, growth media, sample site (ie.), incubation temperature Results: (Attach results) Answer the Following Questions; 1. Bacteria are the most widely distributed organism in the biosphere. Tor F 2. Bacteria occur as part of the normal flora of humans'. T or F Tor F T or F 3. B acteria occupy sites on surfaces such as the skin and intestinal tract of humans. 4. Bacteria 5. Macroscopic characteristics for bacterial cultures grown on 6. Macroscopic characteristics for bacterial cultures grown in nutrient broth include: degrade sewage & waste, and are active in recycling nitrogen & carbon. nutrient agar slants include: filiform, echinulate, beaded, effuse, arborescent, rhizoid. (pg. 248). T or F surface, subsurface and sediment characteristics (pg. 248). T or F Macroscopic characteristics for bacterial cultures grown on nutrient agar plates covers: configurations, margins, eevations (pg. 250). Tor F 7. 8. Why is the level of contamination measured as the number of colonies rather than the sizs of colonics? 9 Compare the ribosomes of prokaryotes to the ribosomes eukaryotes. Prokaryotes & Eukaryotic ribosomes are (Hint: A Svedberg unit ribosomes are (symbol S) is a unit of sedimentation rate. The test is performed in a test tube, which is under the centrifugal force ofa centrifuge, and it enables the characterization of macromolecules based on size and shape). See Talaro -page 116, Table 4.5, types of ribosomes for bacteria, archaea, and cukarya) 10. List the motility mechanisms in bacteria 11. List the motility mechanisms in eukaryotic microorganisms

Explanation / Answer

1.True

2.True

3.True

4.True

5.True

6.True

7.True

Explanation for 1-7: All the statements mentioned from 1-7 are characteristic of bacteria and hence all are true.

8.This is because colony size is an indication of growth rate .Each cell gives rise to a colony and the number of colonies indicates how many cells are present or what is the level of contamination.

9.The difference in ribosomes of prokaryotes and eukaryotes is prokaryotes ribosomes are 70S with 2 subunits of 50S and 30S and eukaryotic ribosomes are 80S with 2 subunits of 60S and 40S.

10.Motility mechanisms in bacteria are:

11.Motility mechanisms in eukaryotic organisms include:

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