In the geological time scale, which of the following eras is miss-matched with the organisms?
A. Precambrian -- protists evolve
B. Mesozoic -- appearance and spread of flowering plants
C. Paleozoic -- forests of cycads
D. Cenozoic -- humans
Ans: C. Paleozoic -- forests of cycads
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Which of the following is a defining property of all living organisms?
a. Having energy processing abilities b. Showing bilateral symmetry c. Engaging in sexual reproduction d. Adapting at a constant rate
You are growing Bacillus subtilis, an aerobic bacterium that can also carry out fermentation when required, in a bioreactor and notice that the growth rate has slowed and the pH has decreased. You suspect the bacteria are
A) using the Krebs cycle. B) fermenting. C) photosynthesizing. D) using proteins. E) dead.
mRNA surveillance mechanisms are necessary ________
A) to measure the concentration of mRNAs in the cytoplasm B) for polyadenylation at the 3' end of mRNA C) in determining which alternative splice site should be used D) to recruit general transcription factors to the promoter E) to eliminate mRNAs with a premature stop codon
A zoo is hand-rearing an endangered species of songbird. What is the best approach to help prepare the males to attract mates?
A. Expose the males to each other during the critical period to initiate development of song circuits during the critical period. B. Expose the males to female pheromones from their species to initiate development of song circuits during the critical period. C. Expose the males to a variety of birdsongs during the critical period. D. Expose the males to a mentor male bird singing their species' song during the critical period.