Which of the following bacterial genera includes species that protect areas of the body such as the intestinal tract and the vagina from invasion by pathogens?
A) Staphylococcus
B) Listeria
C) Lactobacillus
D) Mycobacterium
E) Corynebacterium
C
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Bartel's research group showed that an RNA replicase ribozyme could be created by _____
A) carefully synthesizing a novel ribozyme monomer by monomer based on the sequence of known ribozymes B) creating large numbers of random RNA segments and testing each one to see if any replicase activity was present C) starting with random components and allowing selection to result in molecules that were better and better at replicating D) examining protein replicases and reverse-engineering an RNA molecule capable of doing the same job
Permafrost is ____
a. a temporary pool of water in an estuary b. a permanent pool of water in the grasslands c. permanently frozen ground in the polar icecap d. temporary frozen ground in the polar icecap e. permanently frozen layer of ground in the tundra
Which region represents the highest HANPP as a percentage of local NPP?
A) Australia B) Canada C) South America D) India
Which one of the following statements accurately reflects the nature of mature communities?
A) Mature communities have more consumers than producers, because the producers are so efficient. B) Mature communities develop very quickly. C) Succession begins once a mature community has been established. D) Mature communities are so well established that when disturbed, they quickly recover. E) Mature communities are the most efficient in terms of energy utilization and exhibit the greatest species diversity.