If 15% of the nitrogenous bases in a sample of DNA from a particular organism are thymine, what percentage should be cytosine?
A) 70% B) 40% C) 35% D) 30% E) 15%
Answer: C
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Which one of the following is believed to be the major event that led to the appearance of diverse, complex multicellular organisms on Earth?
A. the increase in atmospheric oxygen B. the appearance of animals C. the appearance of plants on land D. the appearance of bulk transport systems
What three factors determine the ecological efficiencies of consumers?
a. assimilation and harvesting efficiencies, and nutrient volume b. assimilation and harvesting efficiencies, and water volume c. production, harvesting, and assimilation efficiencies d. production and harvesting efficiencies, and amount of sunlight e. production and harvesting efficiencies, and percentage of decomposers
The bacterium that in part causes acne is
a. Propionibacterium b. Porphyromonas c. Streptococcus d. Lactobacillus e. Clostridium
Many species of insects undergo a state of arrested development in their life cycle to avoid desiccation or cold, referred to as
A) torpor. B) hibernation. C) diapause. D) metamorphosis.