Refer to an experiment that was performed to separate DNA fragments from four samples radioactively labeled with 32 P. The fragments were separated by gel electrophoresis.
(A) relative amounts of radioactivity in the DNA
(B) number of cleavage points per fragment
(C) size of each fragment
(D) overall positive charge of each fragment
(E) solubility of each fragment
Answer: C
The electrophoretic separation of the pieces of DNA in each of the four samples was achieved because of differential migration of the DNA fragments in an electric field. This differential migration was caused by the
(A) relative amounts of radioactivity in the DNA
(B) number of cleavage points per fragment
(C) size of each fragment
(D) overall positive charge of each fragment
(E) solubility of each fragment
Answer: C
Learn More :
AP Biology
- The three basic variables that make up the life history of an organism are
- Natural selection involves energetic trade-offs between
- Which of the following can contribute to density-dependent regulation of populations?
- Which of the following is an example of Batesian mimicry?
- Which of the following is an example of aposematic coloration?
- Which of the following best describes resource partitioning?
- Two barnacles, Balanus and Chthamalus, can both survive on the lower rocks just above the low-tide line on the Scottish coast, but only Balanus actually does so, with Chthamalus adopting a higher zone. Which of the following best accounts for this niche separation?
- The lionfish is a venomous fish found primarily in the Red Sea and the Indian Ocean. In the 1990's, lionfish were accidentally released into the Atlantic Ocean, where they found abundant resources and favorable environmental condition. Which of the following scenarios is most likely to result in the lionfish having a major impact on the community into which they were introduced?
- Which of the following is the most accepted hypothesis as to why invasive species take over communities into which they have been introduced?
- During the course of the formation of a parasite/host relationship, a critical first step in this evolution would be
- Based on the experimental results, which of the following is the best evolutionary explanation for the occurrence of ARD in C. elegans?
- Which of the following conclusions is most consistent with the data shown in Figure 2?
- The average brood size per mated individual upon reintroduction of food following 30 days of ARD is closest to which of the following?
- Which of the following best describes the reproductive ability of C. elegans following the ARD induced in the first experiment?
- A scientist is evaluating a proposal for raising large numbers of fish in ocean pens for human consumption. As part of the evaluation, the scientist is designing a plan for investigating how fish in the ocean pens might affect nearby ecosystems. Which of the following is the most appropriate factor to use as the dependent variable in the experimental investigation?
- If a dam is built downstream and prevents salmon migration to the test sites, which of the following most accurately predicts the impact on nitrogen influx?
- Which of the following pieces of additional data would help further investigate the relationship between bears, salmon, and influx of nitrogen into the local environment?
- Which of the following most likely describes how the interaction between bears and salmon influences nitrogen dynamics in the environment?
- Which of the following statements is best supported by the data?
- In the year 2000, specimens of C.taxifolia, a green algae used in tropical aquariums was found off the coast of California. It is native to the Indian Ocean. It is known for aggressive reproduction and an ability to compete with sea grasses. It is currently on an international list of invasive species. Which of the following best predicts the consequences of the introduction of C. taxifolia to the California coast?
- The graph above represents the number of individuals in a population of wolves and in a population of moose observed in the same isolated geographic area over a 40 year period. Which of the following statements about the two populations in supported by the graph?
- Density-dependent factors are related to which of the following?
- As N approaches K for a certain population, which of the following is predicted by the logistic equation?
- Natural selection has led to the evolution of diverse natural history strategies, which have in common
- Which of the following communities is most likely to be stable?