Which of the following best describes the control group for this experiment? a) mating between male flies raised on maltose medium and female flies on starch medium. b) mating between male and female flies raised on starch medium in different populations. c)mating between female flies raised on maltose medium and male flies raised on starch medium.

Based on the fingerprint, do you think Son and Father were independently infected by L. monocytogenes from two different sources, or from the same source? Explain your answer in simplest terms

As shown , several medical agents are now commercially produced by genetically engineered microorganisms. Discuss the advantages and disadvantages of making these agents this way.

For the following sets of partial diploid bacteria, how do I fill out this table? I am not sure how to tell the difference between inducible and constitutive?

With the technique of interrupted mating four Hfr strains were tested for the sequence in which they transmitted a number of different genes to an F strain. Each Hfr strain was found to transmit its genes is a unique sequence, as shown in the accompanying table. What is the gene sequence in the original strain from which these Hfr strains were derived?

What is an example of a measurement error statment for doing an experiment dealing with counting Colony forming units?

Type S Streptococcus pneumoniae bacterium is lethal and will kill its host. If heat inactivated the S strain dies and becomes nonlethal. Type R Streptococcus pneumoniae is a nonvirulent strain of bacteria. What would occur if one were to inject both the R strain and heat-killed S strains into a host organism such as the mouse? The R strain would be transformed into the virulent S strain and kill the host. Neither the S nor the R strain would change. The R strain would be transformed into the virulent S strain and not affect the host. The S strain would be transformed into the nonvirulent R strain and not affect the host The S strain would be transformed into the nonvirulent R strain and kill the host.

Proteus vulgaris has a doubling time of roughly 28 minutes. If an initial population of 500 cells is allowed to grow for 6 hours in ideal conditions, what will be the final population? Use three significant figures for your final answer (e.g. 16,796.654 would become 16,800).

The results of a bacterial population study done with plate dilutions were as follows: 297 colonies on the 1/1000 (10-3) plate 33 colonies on the 1/10,000 (10-4) plate What is the average titer (or original cell density)? Note: Your answer should be presented to the nearest whole number (not including decimal).

In a series of infection experiments, a researcher discovers that the ID50 value for the infectious bacterium Parasiticum mucoides is 2,000, and that the ID50 for another infectious bacterium, Donoteatum thisbacterium, is 150.  Given these data, a person exposed to 1,000 bacteria of each type would be more likely to be infected by which bacterium? There is no way to know given the information provided Both infections are equally likely Donoteatum thisbacterium Parasiticum mucoides