As a transitional form, Archaeopteryx is important because it provides insight into
a. the evolution of birds into reptiles.
b. the relationship between dinosaurs and birds.
c. adaptations for animals moving from an aquatic to a land environment.
d. all of these
B
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Suppose a researcher for a pest-control company developed a chemical that inhibited the development of an embryonic mosquito's endodermal cells. Which of the following would be a likely mechanism by which this pesticide works?
A) The mosquito would develop a weakened exoskeleton that would make it vulnerable to trauma. B) The mosquito would have trouble digesting food, due to impaired gut function. C) The mosquito would have trouble with respiration and circulation, due to impaired muscle function. D) The mosquito wouldn't be affected at all.
One example of an innovation from an unexpected source comes from studies of tumor-like plant growths. What information did the study of plant tumors provide that was critical for plant genetic engineering?
A) understanding the role of plant hormones in growth promotion B) knowledge of plant tumor suppressor and proto-oncogenes C) learning that metastasis is critical for tumor progression D) learning the biosynthetic pathway to ?-carotene E) discovery of a plasmid that could be modified to introduce genes into plants
The most abundant class of antibodies in serum is ________.
A. IgG B. IgE C. IgD D. IgA E. IgM
Adjacent water molecules are connected by the ________
A) sharing of electrons between the hydrogen of one water molecule and the oxygen of another water molecule B) electrical attraction between the hydrogen of one water molecule and the oxygen of another water molecule C) sharing of electrons between adjacent oxygen molecules D) electrical attraction between the hydrogen atoms of adjacent water molecules