A biodiversity hot spot is an area that
1.has a large number of endemic species.
2.is found in warm tropical regions.
3.is at risk due to global warming.
4.is considered a high priority for conservation efforts.
4
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Gehring tested the hypothesis that the Pax6 gene acts as a master regulator of eye development by engineering Drosophila Pax6 genes to be expressed in Drosophila antennae. What happened, and did it support or refute his hypothesis?
A. A compound eye developed on the antenna; this supports the hypothesis. B. A compound eye developed on the head; this supports the hypothesis. C. The antenna developed normally; this falsified the hypothesis. D. The antenna developed where the eye normally would be; this supports the hypothesis. E. The antenna developed where the eye would normally be; this falsified the hypothesis.
What is the greatest risk factor for cancer?
a. family history b. age c. environmental toxins d. diet e. physical inactivity
Which of the following situations would be best for growing most plants?
a. a soil with very small air spaces b. a soil with relatively large air spaces c. a soil with air spaces filled almost entirely with water d. a soil with various sizes of air spaces
Which of the following features enable organisms like planarian to respire and exchange nutrients?
A. a trilobed gastrovascular cavity B. coelomic fluid C. an open circulatory system D. closed circulatory system