Researchers discovered that a new strain of bacteria that causes tuberculosis (M. tuberculosis) has a point mutation in the rpoB gene that codes for part of the RNA polymerase enzyme. This mutant form of RNA polymerase does not function as well as the more common form of RNA polymerase. A commonly used antibiotic called rifampin does not affect the mutant rpoB bacteria.A researcher mixes M. tuberculosis with and without the rpoB mutation and adds the bacteria to cell cultures. Half the cell cultures contain only standard nutrients, while the other half of the cell cultures contain rifampin and the standard nutrients. After many cell generations, you might expect the researcher to find________.

Which of the following is NOT true regarding antibiotics and antibiotic resistance?

Claytonia virginica is a woodland spring herb with flowers that vary from white to pale pink to bright pink. Slugs prefer to eat pink-flowering plants over white-flowering plants, and plants experiencing this severe herbivory are more likely to die. The bees that pollinate this plant also prefer pink to white flowers, so Claytonia with pink flowers have greater relative fruit set (a measure of fitness) than Claytonia with white flowers. A researcher observes that the percentage of different flower colors remains stable in the study population from year to year. With no other information, if the researcher removes all slugs from the study population, what do you expect to happen to the distribution of flower colors in the population over time?

Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While studying these animals, you notice that males with longer hair get more opportunities to mate and father more offspring. To test the hypothesis that having longer hair is adaptive in these males, you should FIRST ________.

The Hawaiian archipelago (collection of islands) is way out in the Pacific Ocean.  This chain of islands was created by a volcanic “hotspot” that formed each island over many millions of years.  Soon after the newest island of Hawaii (“the big island”) rose above the sea surface (somewhat less than 1 million years ago) and organisms colonized the island, the evolution of life on this new island should have been most strongly influenced by:

Large male horned dung beetles, Onthophagus taurus, use their horns as weapons in fights with rival males over ownership of breeding tunnels containing females. Females excavate (dig) tunnels beneath fresh dung (manure) piles where they mate with the males, and then lay their eggs. The use of the horns by the males in contest for the breeding tunnels is an example of: I:   intersexual selectionII:  intrasexual selectionIII: sexual selection

Phenylthiocarbamide (PTC) is a compound that tastes either very bitter or is tasteless, depending on the person’s genetic makeup.  Suppose 64 percent of people living in a remote, isolated mountain village can taste PTC and must, therefore, have at least one copy of the dominant PTC taster allele. If this population conforms to Hardy-Weinberg expectations for this gene, what percentage of the population must be heterozygous for this trait?

A zombie apocalypse wipes out almost the entire human species before the zombie threat is eliminated. Only a group of 100 people who were at a family reunion on an uninhabited island survived. They returned to the mainland completely unaware of what had happened to everyone. Certain traits will have been lost from the gene pool forever. This loss of diversity in a reduced population is called 

Darwin and Wallace’s theory of evolution by natural selection was revolutionary because it:

True or False. A test administered to a group of 5-year-old children classifies 10 percent as “at risk” for learning difficulties. By measuring the extent to which the test correctly predicted classification at the end of the third grade, you determine the predictive power of the test.