CH_14 - CH 14 1. DNA in eukaryotes is wrapped around...

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CH 14 1. DNA in eukaryotes is wrapped around special proteins to form structures that look like beads on a string. These structures are called _______. Answer: nucleosomes 2. Segments of a gene that are transcribed but do not encode part of the protein product are called _______. Answer: introns 3. DNA sequences called _______ can replicate and insert themselves into different parts of the genome. Answer: transposable elements 4. Members of a gene family that do not make a functional gene product are called _______. Answer: pseudogenes 5. The RNA of snRNPs are complementary to _______ sequences located at the intron– exon boundaries. Answer: consensus 6. When you stain a preparation of epithelial cells from a female rat, you observe one highly condensed chromosome in interphase nuclei. This is the inactive X chromosome, or _______. Answer: Barr body 7. During the development of amphibian oocytes, the number of genes encoding the rRNA increases. This increase is called _______. Answer: gene amplification 8. Those DNA sequences that are not represented in the mRNA are referred to as intervening sequences, or _______. Answer: introns 9. Most _______ are probably duplicate genes that changed so much during evolution that they no longer function. Answer: pseudogenes 10. During RNA splicing, different snRNPs constitute a “splicing machine” called a _______. Answer: spliceosome 11. There are at least three ways in which _______ may be controlled: (1) Genes may be inactivated; (2) specific genes may be amplified; and (3) specific genes may be selectively transcribed.
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12. In both prokaryotes and eukaryotes, the _______ is a stretch of DNA to which RNA polymerase binds to initiate transcription. Answer: promoter 13. The gene that codes for an RNAi that binds to Xist RNA at the active X chromosome is _______. Answer: Tsix 14. The process of discerning protein product and function of a known gene sequence is called _______. Answer: annotation 15. A DNA sequence that signals the end of transcription in eukaryotes is called the _______. Answer: terminator Multiple Choice 1. Among eukaryotes, there is _______ relationship between complexity and genome size. a. an inverse b. a direct c. not always an inverse d. not always a direct e. no Answer: d 2. In eukaryotic cells, transcription and translation a. are separated: Translation occurs in the nucleus, and transcription occurs in the cytoplasm. b. occur together in the cytosol. c. occur together in the nucleus. d. are separated: Translation occurs in the cytoplasm, and transcription occurs in the nucleus. e. are separated, except for proteins that bind to the DNA and ribosomes, which are translated in the nucleus. Answer: d
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CH_14 - CH 14 1. DNA in eukaryotes is wrapped around...

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