Nondisjunction refers to
a. failure of homologous pairs to separate during meiosis.
b. improper pairing of nonhomologous chromosomes during meiosis.
c. failure of sister chromatids to pair during mitosis.
d. failure of homologous pairs or sister chromatids to separate during meiosis.
e. failure of homologous pairs to separate during mitosis.
D
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Mutations in the DFNA20/26 locus, which codes for the actin gamma 1 protein, are associated with congenital deafness. An irate senator complains that government money is being wasted on studies of this mutant gene -- in yeast! "I am no biologist," says the senator, "but I am pretty sure yeast don't have ears." How do you respond?
A. "You are right, Senator -- yeast do not have ears. We should revoke the funding immediately." B. "We can learn valuable information about the structure of the mutant protein by expressing it in yeast. It is difficult to collect large amounts of actin from tiny hair cells, and unethical to collect it from human patients." C. "We can learn valuable information about the transcription of the mutant gene in yeast. It is much more difficult to study transcription in human cells." D. "We can learn valuable information about sound transmission through the mutant yeast. By placing a speaker against a yeast vial and recording sound from the other side, we can infer how the mutant actin affects sound waves." 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 mutant genes? 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?
The Nod factor is an important component of
A. the Calvin Cycle. B. legume-bacterial interactions. C. mycorrhizal-terrestrial plant interactions. D. the formation of the digestive enzymes of carnivorous plants. E. trichloroethylene metabolism.
Lysosomes digest unneeded intracellular debris through the process of
A. pinocytosis. B. exocytosis. C. autophagy. D. phagocytosis. E. endocytosis.
Which form of anthrax is usually treatable with an antibiotic?
a. cutaneous anthrax b. inhalation anthrax c. intestinal anthrax d. none of the above