You are the managing naturalist for a natural history museum that has just received a batch of fossils from one of the field paleontologists sponsored by the museum. The note in the box states the fossils all came from the same rock layer. The museum is organized according to geologic timescale, and its management needs you to tell them to which department (based on era) and period specialist (an individual with experience with life-forms of a particular geologic-timescale period) the fossils should go. You find fossils of fish and seed-bearing plants but no reptiles or higher animals and no flowering plants. To which era do these fossils belong?
A) Precambrian
B) Paleozoic
C) Mesozoic
D) Cenozoic
Answer: B) Paleozoic
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Which of the following statements best describes the difference between a dikaryon and a heterokaryon?
A. There is no difference, the two are identical. B. A dikaryotic cell has two nuclei and a heterokaryon has three or more nuclei. C. A dikaryotic cell is diploid and a heterokaryon is haploid. D. A dikaryotic cell is involved in sexual reproduction and a heterokaryon is involved in asexual reproduction. E. A dikaryotic cell is haploid and a heterokaryon is diploid.
The second law of thermodynamics says that during energy transformations, some of the energy will be lost as which of the following?
a. chemical bonds b. position c. heat d. motion
The THI-element is part of the operon that controls synthesis of thymine in mRNA.
Answer the following statement true (T) or false (F)
________ are large areas that have similar environmental conditions and characteristic plant communities
A) Ecosystems B) Biomes C) Biospheres D) Climax communities E) Climatic zones