Which of the following antibiotics disrupts cytoplasmic membrane function in fungi?
A) streptomycin
B) erythromycin
C) tetracycline
D) penicillin
E) amphotericin B
E
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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 over white-flowering plants (due to chemical differences between the two), and plants experiencing severe
herbivory are more likely to die. The bees that pollinate this plant also prefer pink to white flowers, so that Claytonia with pink flowers have greater relative fruit set 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. Given 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? A) The percentage of pink flowers should increase over time. B) The percentage of white flowers should increase over time. C) The distribution of flower colors should not change. D) The distribution of flower colors should randomly fluctuate over time.
Which of the following is the strongest evidence for
the idea that present-day eukaryotic aerobes are the descendants of the successful symbiotic association of anaerobes and aerobes? a. Mitochondria can produce ATP. b. A mitochondrion can survive indefinitely when removed from a eukaryotic cell. c. A mitochondrion has its own set of DNA molecules. d. Fossilized mitochondria are older than the oldest fossilized eukaryotes. e. All eukaryotic cells have mitochondria.
From earliest to latest, the overall sequence of early development proceeds in which of the following sequences?
A) first cell division ? synthesis of embryo's DNA begins ? acrosomal reaction ? cortical reaction B) cortical reaction ? synthesis of embryo's DNA begins ? acrosomal reaction ? first cell division C) cortical reaction ? acrosomal reaction ? first cell division ? synthesis of embryo's DNA begins D) acrosomal reaction ? cortical reaction ? synthesis of embryo's DNA begins ? first cell division
HIV does the greatest damage to
A) the adrenal glands. B) pancreatic cells. C) nervous tissue. D) white blood cells.