In a normal fruit fly, the second thoracic segment has wings and the third thoracic segment has halteres (small knobbed structures that act as a balance and guidance system). A mutant fruit fly is identified in which the third thoracic segment produces wings instead of halteres. This abnormal fly has a mutation in which of the following?
A. a maternal effect gene
B. a gap gene
C. a homeotic gene
D. a segment polarity gene
C. a homeotic gene
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Which of the following structural features of epithelial tissues are related to the function of these cells? Epithelial cells _____
A) have polarity B) have a long life span C) have low rates of mitosis and cytokinesis D) are loosely packed
Although all P-type ATPases use the energy of ATP hydrolysis to transport solutes they differ in which of the following?
A) structure B) mechanism C) localization in cells D) physiological roles E) All of the above are correct.
Which of the following is NOT a correct statement about food chains?
a. the food-chain concept is helpful in thinking about community interactions, but is probably an oversimplification of the actual interactions b. food webs show the relationships among multiple food chains c. food webs are b better than food chains for showing the position of omnivores within the community d. food chains are often complex and intertwined e. all of the above are correct statements about food chains
A mutation in a single gene always has only one discrete effect on an individual's phenotype.
Answer the following statement true (T) or false (F)