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BIOS 242 Week 3 Lobster OL Bacterial Isolation

Learning Objectives:

  • Understand the significance of bacterial growth in investigating pathological microorganisms.
  • Apply aseptic techniques to maintain sterile conditions.
  • Define the concept of a single colony.
  • Perform plate-streaking techniques for bacterial isolation.
  • Utilize selective media for isolation purposes.


Welcome to the Bacterial Isolation virtual simulation lab. In this lab, we will address the contamination of poultry meat by a dangerous antibiotic-resistant bacterial strain. By collecting samples from this deadly bacteria among various species. This process involves practicing sterile techniques and mastering the plate streaking technique.

Identifying ampicillin-resistant bacteria:

The lab focuses on identifying the strain of bacteria resistant to ampicillin in poultry meat. Your task is to collect a sample containing multiple bacterial strains and isolate the ones resistant to ampicillin by obtaining single colonies.

Aseptic technique:

Throughout the Bacterial Isolation lab, you will learn and apply aseptic techniques. Turn on the Bunsen burner and sterilize your loop between streaks to maintain a sterile environment.

BIOS 242 Week 3 Lobster OL Bacterial Isolation

Plate streaking technique:

You will employ the plate streaking technique for bacterial isolation to identify the specific bacterial strain. You have unlimited agar plates, allowing you to practice the method repeatedly. Results are provided immediately, unlike in real-life situations where incubation takes 24 hours. Additionally, you will streak a special Salmonella Shigella agar, promoting Gram-negative strains’ growth. Each song will exhibit a unique phenotype on this agar, aiding in identifying the ampicillin-resistant pressure. Once identified, the sample will undergo further analysis for confirmation.


Purpose: Can you describe the purpose of this experiment in complete sentences and your own words?

The knowledge and practical experience in culturing and isolating bacteria. We performed the plate streaking technique to separate and test different bacterial strains. This allowed us to understand the process of bacterial isolation and its significance in microbiological research.

Why is proper aseptic technique important in microbiology?

Proper aseptic technique is essential in microbiology to prevent contamination and maintain the experiment’s integrity. It ensures that unwanted microorganisms from the environment do not interfere with the cultured bacteria. By following aseptic techniques, we can obtain reliable and accurate results.

Flaming the inoculating loop or needle before and after each injection serves two essential purposes. Firstly, it sterilizes the instrument, eliminating any bacteria that may be present. Secondly, it prevents cross-contamination between different samples, ensuring the purity of the tested cultures.

BIOS 242 Week 3 Lobster OL Bacterial Isolation

Failing to wait for the appropriate time after flame sterilization can have consequences. The instruments might still be hot, and if they come into contact with the bacterial culture, bacteria render the experiment invalid or inaccurate.

Why is it essential to flame the neck of the tubes immediately after uncapping and before recapping the lines?

Flaming the neck of the tubes immediately after uncapping and before recapping is crucial to maintain sterility. It prevents any bacteria from the environment from entering the box and contaminating the sample. By flaming the neck, we create a barrier that ensures the integrity of the culture.

Reflection: Please write five sentences about what was included in the simulation.

During this simulation, I learned about the risks associated with antibiotic-resistant bacteria, particularly in poultry. It highlighted the importance of thorough cooking to prevent infections. I also gained practical experience in bacterial isolation and the plate streaking technique, which enhanced my understanding of microbiological procedures. I enjoyed the opportunity to repeat the experiment when I made mistakes, allowing me to improve my practice. However, I found the occasional freezing of the simulation frustrating as it disrupted the flow of the experiment and extended the time needed to complete the assignment.

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