Question

The transport of zymogenous microorganisms typically occurs in stages (alternating periods of high transport and then low transport). Hypothesize what is happening when there is high transport and what is happening when there is low transport.

In the laboratory, an aerobic chemoorganoheterotrophic bacterium is genetically-modified to produce copious amounts of glycocalyx in response to toxic metal exposure. Once the bacterium is added to a field soil, however, you notice that there is no resulting change in the bioavailable concentrations of arsenic deep in the soil. Provide three explanations why this may be the case.

Answer 1

Question 1

Zymogenous are the group of bacteria that change their habitat very frequently. They show this transient habiat behaviour according to the food or nutrition availability. So, when these bacteria show high transport it means these bacteria have less nutrition availability, therefore they are moving to other habitat. On the other hand, when they are showing less movement, it means they have enough nutrition.

Question 2

Three reasons that there is no resulting change in the bioavailable concentrations of arsenic deep in the soil are:

I. The bacterium do not have the gene for producing glycocalyx in respinse to toxic chemical.

II. The bacterium gene is mutated so that it is not able to produce glycocalyx.

III. The soil do not have enough arsenic toxicity that force the release of glycocalyc in metal toxicity in soil