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Gram stain lab report results

26/03/2021 Client: saad24vbs Deadline: 2 Day

Lab 4: Structure and Microscopy (100 points)

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-Each question on the lab worksheet must be answered completely, thoroughly, in complete sentences and correctly in order to be considered for full credit
-If the question asks you to do research or find a source, a reputable, credible and/or scholarly source citation must be included in order to be considered for full credit
-If a math formula is required to arrive to an answer, work must be shown otherwise, no credit will be awarded
Pre-Lab Questions
1. What determines if a bacterial cell is Gram-positive or Gram-negative? (5 points)

Amount and location of the peptidoglycan molecule in the prokaryotic cell wall determines whether a bacterial cell is Gram-positive or Gram-negative.

2. In this lab, both viruses and prions were introduced as acellular organisms. Do some research and describe one other type of acellular organism. What characteristics about this organism classify it as acellular? (5 points)

Viroids are another type of acellular organism along with viruses and prions. They are plant pathogens, which consist only of a short strand of circular RNA capable of self-replication.

3. Bacteria have many different shapes that often determine their class. Research and form a hypothesis on the evolutionary reasons for so many different bacterial morphologies. (5 points)

Each bacterial morphology may be a selectable feature to aid survival and may have affected by different physical, environmental, and biological forces to contribute to natural selection.

Reference:

Young, K. D. (2006, September). The Selective Value of Bacterial Shape. Retrieved September 30, 2018, from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1594593/

4. Do a search online or look in your textbook for 1-2 antibiotics that affect Gram-positive bacteria and list them. On what part of the cell do the antibiotics usually work? List one or two antibiotics that affect Gram-negative bacteria? On what part of the cell do the antibiotics usually work? (Be sure to cite your sources in your answer.) (5 points)

5. Why do you think it is important to identify a bacterial disease in a patient before prescribing any antibiotic treatments? (Be specific.) (5 points)

d

Experiment 1 Results Tables
Table 1: Experiment 1 Staining Observations (5 points)

Stain used:

Crystal Violet

Observations:

Purple rod-shape bacteria with white background were observed

Experiment 1 Post-Lab Questions
1. How does crystal violet enhance the visualization of microbial features? (5 points)

Crystal violet enhances the contrast between the microorganism itself and the slide, making the bacteria appear as purple.

2. What are some of the limitations of simple staining? (5 points)

3. Give an example of a situation in a lab or medical setting in which simple staining would be utilized. (5 points)

Simple staining is used to obtain basic information about morphology of one type of microorganism through clear visualization.

Experiment 2 Results Tables
Table 2: Experiment 2 Staining Observations (5 points)

Stain used:

Nigrosin

Observations:

Background is stained, bacteria shows up as clear spiral.

Experiment 2 Post-Lab Questions
1. After visualizing the stained samples either using your microscope or by looking at the sample images provided, describe what physical/visual characteristics you were able to observe after performing the negative staining vs. after performing the simple stain. (5 points)

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