What form of coloration is shown by many seahorses?
A. aposematic.
B. Mullerian.
C. Batesian.
D. crypsis.
E. aposematic and Batesian.
D. crypsis.
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The formulation of a model for a structure or for a process serves which of the following purposes?
A) It asks a scientific question. B) It functions as a testable hypothesis. C) It records observations. D) It serves as a data point among results. E) It can be arrived at only after years of experimentation.
What did Richard Axel and Linda Buck discover about the way in which we are able to perceive many different types of odors?
A. Many different types of odors bind to just a few different types of receptor molecules. B. Vertebrate animals make a large number of distinct types of receptor proteins, each of which binds a particular odorant molecule or small group of such molecules. C. Odors are distinguished by the way in which they bind both olfactory and taste receptors—it is the overall "picture" generated this way that we perceive. D. None of these choices are correct.
Misexpression of the Pax6 gene was shown to promote eye development in both vertebrates and invertebrates. The authors of this study suggested that this was evidence that eyes evolved only once. What other evidence contradicts this view?
Pax6 is a transcription factor noted for its unique role in specifying eye development across the animal kingdom. A homologous gene known as eyeless specifies eyes in Drosophila, and misexpression of mouse Pax6 can cause ectopic eyes in flies! This creates a quandary -- how can we explain the universality of the master regulatory gene for eye development, with the striking variability of eye anatomy in different phyla? A. Invertebrates normally have only simple eyespots. B. Many different transcription factors can initiate eye development when misexpressed. C. While the anatomy of all animal eyes is the same, lens proteins vary greatly. D. The anatomical structure of insect, mollusk, and vertebrate eyes are quite different. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about eyes? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Polymerization of nucleotides to form nucleic acids involves the formation of _______ bonds.
a. peptide b. phosphodiester c. glycosidic d. hydrogen