4. To determine the frequency of ala mutants a fluctuation test was done using 30 tubes with a final concentration of 108 bacteria each. From
each tube 0.1 ml of culture was plated on medium that selects for ala
mutants. 27 of the tubes yielded ala mutants but 3 of the tubes yielded
no mutants. Based upon these results, use the Luria-Delbruck
calculation to determine the mutation rate to ala.

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

In which specialized organ of the plant would these cells most likely be found

There is a liquid capsule inside a cup full of liquid. the cup full of liquid has salt in it and the liquid capsule has no salt in it. in which direction will the solvent flow? a. the salt does not have to move b. from the capsule to the larger cup c. equally between the capsule and the cup d. from the larger cup to the capsule