Which one of the following statements CORRECTLY compares the effects of a mutation in a gamete to the effects of a mutation in a somatic cell?
A) Somatic cell mutations always cause cancer, whereas gamete mutations do not.
B) Gamete mutations are passed to the next generation, whereas somatic cell mutations are not.
C) Gamete mutations are typically deadly, whereas somatic cell mutations are not.
D) Somatic cell mutations are typically deadly, whereas gamete mutations are not.
E) Mutations in both types of cells usually result in cancer.
B
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Refer to Figure 44-1 in the book. To which group are sponges more closely related?
A. choanoflagellates B. bilaterians C. equal relationship to both choanoflagellates and biletarians
Growing useful mutants that develop from callus culture is called ____
a. fragmentation b. protoplast fusion c. somaclonal selection d. grafting e. apomixes
You are breeding different varieties of roses in your garden. When you cross a true-breeding yellow "Texas Beauty" rose with a true-breeding "Ruby" red rose, you get all red roses. But when you cross a "Texas Beauty" yellow with the yellow variety "Jealousy," you get a 9:7 ratio of red to yellow flowers! What can you conclude from these results?
A. There is no recessive allele for the red pigment gene. B. There is a mutation in the gene for yellow pigment in the "Jealousy" variety. C. The environment, and not genes, influences pigment in these rose varieties. D. There are epistatic interactions between at least two genes for rose pigment. E. The red allele is dominant to the yellow allele.
Why are slow-twitch muscles dark?
A. They are designed for strength and explosions of energy. B. They have fewer mitochondria. C. They have many more myofibrils per motor unit than fast-twitch fibers. D. They contain myoglobin. E. They need less blood than fast-twitch fibers.