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- 13. A researcher discovered that a certain cell does not have any nucleosome modifiers. What is the effect of missing these modifiers?11. Regarding nucleosome structure, which of the following statements is correct? A. Nucleosomesare spherical structures comprised of RNA, nonhistone proteins and histoneproteins. B. Themajor histones comprising nucleosomes are H1 and H4. C. Nucleosomes permit efficient packing of DNA to about one seventh its normal length. D. Thehistone associated with the DNA in the linker region holding nucleosomes iscalled H2A. E. Allof the above. 12. Which of the following is a part of the promoter of a tRNA gene in eucaryotes? A. INR B. boxA C. TATAbox D. upstream control element E. response elements5. During cytokinesis, a cell will divide into 2 daughter cells. Explain the difference between a cleavage furrow and a cell plate.
- 12. If you were to examine a sample of 1000 cells, in which of the phases listed below would you expect to find most of the cells? (LS1-4) * Interphase Anaphase Metaphase O Telophase1. Arrange the following structures from largest to smallest. • a chromosome • a nucleus • a gene Largest SmallestDiscuss the significance of chromosomes in terms of their information content.
- A major difference between hereditary information in eukaryotes and prokaryotes is: a. in prokaryotes, the hereditary information is distributed among individual, linear DNA molecules in the nucleus. b. in eukaryotes, the hereditary information is encoded in a single, circular DNA molecule. c. in prokaryotes, the hereditary information is usually distributed among multiple circular DNA molecules in the cytoplasm. d. in eukaryotes, the hereditary information is distributed among individual, linear DNA molecules in the cytoplasm. e. in eukaryotes, the hereditary information is distributed amoung individual, linear DNA molecules in the nucleus.A nucleosome consists of (a) DNA and scaffolding proteins (b) scaffolding proteins and histones (c) DNA and histones (d) DNA, histones, and scaffolding proteins (e) histones onlyThe first suggestion that chromosomes may physically exchange segments came from the microscopic identification of. synapsis sister chromatids chiasmata alleles
- 5. If dividing cells are grown in a culture medium containing radioactive thymidine, the thymidine will be covalently incorporated into the cell's DNA during replication. The radioactive DNA can be detected in the nuclei of individual cells by autoradiography (i.e.. by placing a photographic film over the cells, radioactive cells will activate the film and show up as black dots when looked at under a microscope). During whatphase of the cell cycle will the radioactive thymidine be incorporated? Why?4. In what organelle of the cell does the process of DNA to mRNA take place?0. Identify TWO major categories of chromatin responsible in compaction of chromosomes.
