The size of soil particles is one of the major factors that determine how much water is available to plants
a. True
b. False
ANSWER: True
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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?
A plant stoma is found between two
a. leaves. b. root hairs. c. xylem veins. d. trichomes. e. guard cells.
Four of the five answers below are correct statements about exoskeletons. Select the exception
a. an exoskeleton consists of noncellular secreted material. b. repeatedly producing new exoskeleton uses resources that the animal could put towards growth and reproduction. c. the exoskeleton is made of bone and cartilage. d. the exoskeleton protects the soft body tissues inside it. e. exoskeletons exist in some invertebrates.
This type of selection favors both extremes of the phenotype spectrum within a population
a. directional b. stabilizing c. disruptive d. natural e. neutral