Question

1.  Explain how an enrichment culture works？

2. What is an opportunistic bacterium?

3. Name three terms that relate to the ability of organisms to survive or thrive at different salt concentrations.

4. In microbiology, the average of repeated measurements is often drawn. In addition, the standard deviation, or the standard error of the mean are calculated and added to plotted as error bars onto the data. What is the difference between standard deviation and standard error?

5.You have a time series experiment, such as a growth curve. Which graph will you use to plot the data?

6.You are attempting to compare samples side by side. Which graph will you use to plot the data?

Answer 1

1. Enrichment culture is a culture in which we promote the growth of one kind of bacteria and inhibit the growth of another. In enrichment culture medium there are some substance which are suitable for the growth of some bacteria and unsuitable for the growth of other bacteria.

Examples of enriched media include sheep blood agar and chocolate (heated blood) agar. Selective media contain ingredients that inhibit the growth of some organisms but allow others to grow.

2. An opportunistic bacterium is a bacterium which takes advantage of the opportunity like a weak immune system, broken or damaged immune system. This bacteria takes the advantage and colonise it or breach through it.