Which molecule is believed to have preceded the other two during the evolution of life?

A. DNA
B. RNA
C. Proteins


Answer: B

Biology & Microbiology

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Animals trapped and digested by "carnivorous" plants such as the cobra lily are used primarily as ____

a. an energy supplement during winter months b. a carbon source for the plant c. a nutrient supplement in nutrient-deficient environments d. food for bacteria and fungi that grow symbiotically with the plant roots e. an energy supplement for small plants growing in shady areas

Biology & Microbiology

In deductive reasoning, specific observations may be used to draw a broad, general conclusion

a. true b. false

Biology & Microbiology

Some botanists argue that the entire plant should be considered as a single unit rather than a composite of many individual cells. Which of the following cellular structures cannot be used to support this view?

A) cell wall B) cell membrane C) cytosol D) tonoplast E) symplast

Biology & Microbiology

The biological diversity encountered increases as one moves from the poles to the tropics. Within a particular latitude, diversity also varies:

A) between different continents B) between different habitats C) as a function of temperature and precipitation D) as a function of topographic complexity E) all of the above

Biology & Microbiology