Besides the presence of vascular tissue, what is the main importance of the plant traits that separate seedless vascular
plants from nonvascular plants?
What will be an ideal response?
ANSWER: In vascular seedless plants, the presence of lignin provides mechanical support for vertical
growth. In addition, the presence of apical meristems allows for a branching shoot system
to develop. Also, roots, stems, and leaves provide for enhanced uptake and transport of
nutrients as well as improved photosynthesis. Finally, the diploid phase of the life cycle
became more dominant resulting in a larger, longer-lived sporophyte.
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Which of the following likely has the most Hox genes?
A) jellyfish B) slugs C) dolphins D) bees
Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
What will be an ideal response?
What is a necessary component of a powerful immune system?
A. immunological tolerance B. strict temperature homeostasis C. thousands of different Ig genes D. a large thymus gland
Double strand DNA fragments are separated by size using
A. restriction analysis. B. FISH. C. PCR. D. northern blotting. E. gel electrophoresis.