What is the main difference between amphibians and reptiles?
A) Reptiles are tied to water for reproduction, while amphibians have amniotic eggs that can survive on dry land.
B) Amphibians are tied to water for reproduction, while reptiles have amniotic eggs that can survive on dry land.
C) Neither are tied to water for reproduction.
D) There is little difference between amphibians and reptiles.
B
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Two solutions of differing glucose concentration are placed in a container separated by a selectively permeable
membrane that restricts large molecules like glucose, but allows the free diffusion of water. What will be the glucose concentration in the container after dynamic equilibrium has been reached?
a. The water molecules will be evenly distributed in the container, with more glucose molecules on one side than the other. b. The volumes of the solution will be different, with a higher volume on the side that originally contained the higher concentration of glucose. c. The volumes of the solution will be different, with a lower volume on the side that originally contained the higher concentration of glucose. d. The glucose concentration of the two solutions will be identical on both sides of the membrane, but the volumes will remain unchanged. e. The volume and concentrations will be unchanged on both sides of the membrane.
When Luria and Delbruck assayed bacterial growth on the petri plates, what did they find?
Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. A) All plates had some bacterial colonies; some plates had more bacterial colonies than others. B) Some plates had no bacterial colonies; others had varied numbers of colonies. C) All plates had a similar number of bacterial colonies. D) Some plates had no bacterial colonies; all of the other plates had a similar number of bacterial colonies. E) No bacterial colonies formed on any of the plates.
Which factor is ultimately responsible for the rapid population explosion of humans?
A. More prevalence of microorganisms to fight diseases naturally B. Increasing availability of natural resources C. Decreasing migration of human and animal populations D. Decline in death rates without an equivalent decline in birth rates E. Advances in reproductive technology
Continuous cell lines differ from primary cell lines in that
A) viruses can be grown in continuous cell lines. B) continuous cell lines always have to be re-isolated from animal tissues. C) continuous cell lines are derived from primary cell lines. D) continuous cell lines can be maintained through an indefinite number of generations. E) continuous cell lines are from human embryos.