Which of the following is important to the development of dorsal structures such as the neural tube and notochord?
A. Spemann's organizer
B. noggin
C. cadherins
D. both Spemann's organizer and noggin
E. both Spemann's organizer and cadherins
D. both Spemann's organizer and noggin
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____ can dominate the zooplankton community of temperate waters
a. Copepods b. Amphipods c. Barnacles d. Shrimp e. Heteropods
What is the site of nitrogen fixation in legumes?
a. mycorrhizae b. root nodules c. phloem d. the cortex e. the pith
Most vessels that feed abdominal organs are branches off the ____
a. ascending aorta b. abdominal aorta c. thoracic aorta d. superior vena cava e. inferior vena cava
Alon claimed that a tincutre of a local herb was effective in lowering anxiety and was planning to invest in the product. As evidence of his claim, Alon, who had anxiety over his financial situation, said that he felt much better after the treatemt, was much more relaxed, and no longer worried about his finances. Which of the following combinations of methodological flaws BEST characterizes Alon's investigation?
a) lack of an appropriate outcome measure b) lack of appropriate controls and lack of an appropriate outcome measure c) lack of randomization, lack of replication, and lack of an appropriate outcome measure d) lack of replication and lack of appropriate controls e) lack of an appropriate outcome measure, replication, randomization, and controls