What characteristics of Caenorhabditis elegans make it useful in molecular genetics studies? What will be an ideal response?
Concepts to Consider: Caenorhabditis has a very simple system of genetic control of development,
individuals can be self-fertilizing hermaphrodites or males, an individual has very few cells, and it is
easy to obtain offspring homozygous for given traits.
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Communal courting areas are called
A. leks. B. mating structures. C. resource areas. D. arenas. E. None of these choices are correct.
The ____ biome has the greatest species richness of the terrestrial biomes
a. tropical rain forest b. savanna c. grassland d. chaparral e. temperate deciduous forest
Which of the following nitrogen bases is found only in RNA and NOT in DNA?
A) uracil B) adenine C) guanine D) cytosine E) thymine
Lampreys completely lack parathyroid glands. Suggest why these glands may be important for other vertebrates, but not for jawless fish.
A. Because they are parasitic, lampreys get plenty of calcium from their hosts. B. Jawless fish employ a different system than other vertebrates to regulate blood sugar. C. Since they have a cartilaginous skeleton but not true bone, they have less need to regulate calcium levels. D. Living in the ocean, they are surrounded by large amounts of sodium, chloride, and magnesium ions.