With the extinction of the dinosaurs 65 million years ago, multiple niches that the dinosaurs once filled opened up and
allowed mammals the opportunity to evolve and exploit those niches. This is an example of ____.
a. sympatric speciation
b. adaptive radiation
c. phylogeny
d. reproductive isolation
e. phylogenetic isolation
ANSWER: b
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Jalapeño peppers contain the chemical capsaicin. If you lack the nociceptors that bind capsaicin, what would be the
predicted outcome?
a. You would be especially sensitive to spicy foods containing capsaicin. b. You would be able to eat foods containing high concentrations of capsaicin and not feel any burning in your mouth. c. You would have the same sensitivity to capsaicin as most other people. d. You would experience a feeling of cold when eating foods containing capsaicin. e. You would be more easily addicted to capsaicin-containing foods than normal individuals.
What key research question was addressed by King and others while studying sponges?
A. Do the genes of sponges contain information that might explain the rapid evolution of animal groups during the Cambrian explosion? B. How similar is the DNA of living marine sponges to that of fossil sponges from the Cambrian? C. Why were the sponges an evolutionary dead end, with little change and diversity since the Cambrian? D. Did sponges survive the precambrian mass extinction, with genes unique from other animal groups? E. Were the sponges the last common ancestor of eumetazoans?
An herbivore is indicated by
a. A. b. B. c. C. d. D. e. E.
T cells that react with self antigens are destroyed through:a
cytokinesis. b. macrophages. c. perforins. d. apoptosis. e. receptor mediated endocytosis