Which of the following would not lead to aneuploidy during meiosis?
(a) sister chromatids segregating inappropriately
(b) non-sister chromatids segregating inappropriately
(c) a reciprocal rearrangement of parts between nonhomologous chromosomes (for example, the left arm of Chromosome 2 exchanging places with the right arm of Chromosome 3)
(d) an extra set of chromosomes produced during S phase (for example, if paternal Chromosome 3 were replicated twice)
(c) Aneuploidy describes cells with an incorrect chromosome number. A reciprocal rearrangement of parts between nonhomologous chromosomes will not lead to aneuploidy—it will simply change the assortment of genes attached to each centromere, while leaving the total amount of DNA and the total number of chromosomes unchanged.
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Compound C is a ____________________.
Assume that you are taking an organic chemistry class. Your teacher has given you four organic compounds to analyze. She tells you that one is a carbohydrate, one is a hydrocarbon, one is a nucleic acid, and one is a protein. You discover that Compound C contains only carbon, hydrogen, oxygen, and nitrogen. Of the four types of compounds which were given to you to analyze, which one best describes Compound C?
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A. proteoglycan B. collagen C. chitin D. laminin E. glycosaminoglycans
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a. oxygen-binding b. ventilation c. open circulatory d. atrial