A nitrogenous base composed of two rings is a (purine/pyrimidine/ribose)
What will be an ideal response?
purine
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Initiation factors are ____ that assist in the initiation of transcription
a. mRNAs b. proteins c. tRNAs d. amino acids e. snRNPs
A small group of mice were released on an island. The island previously had no mice on it, but had abundant food and no predators. After several years of growth, the size of the new island population stabilizes. However, at this point a hurricane drastically reduces the population. How would you describe the situation?
A. The new population size is a result of density-dependent regulation. B. The biotic potential of the population has been reduced. C. The island mouse population can now act as a source metapopulation. D. The new population size is a result of density-independent regulation. E. The island mouse population can now act as a sink metapopulation.
About 530 million years ago, what adaptation evolved to make fish the dominant predators of the sea?
A) Jaws B) Fins C) Sensory organs D) Scales E) Internal skeleton
The oldest proposed cell microfossils come from structures called _____.
A. stromatolites B. crystal filaments C. hydrothermal vents D. pyrite E. tectonic plates