Ch. 19 Bio - Site Title: Campbell, BIOLOGY, 7th Edition...

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Unformatted text preview: Site Title: Campbell, BIOLOGY, 7th Edition Book Title: Biology Book Author: Campbell Location on Site: Home > 19: Eukaryotic Genomes: Organization, Re > Chapter Quiz Submitted: March 10, 2008 at 4:01 PM (EDT) 97% Correct of 32 questions 31 correct: 97% 1 incorrect: 3% More information about scoring 1. There are thought to be about _____ genes in a human cell. (Overview ) Your Answer: 25,000 Correct. This is the current estimate. 2. The chromatin of a eukaryotic nucleus consists mainly of _____. (Concept 19.1 ) Your Answer: linear strands of DNA complexed with large amounts of protein Correct. Eukaryotic cells package their DNA into chromatin. DNA and histone molecules form "beads on a string" consisting of nucleosomes in an extended configuration. 3. In eukaryotes, the structures consisting of associations of histones and DNA are called _____. (Concept 19.1 ) Your Answer: nucleosomes Correct. DNA and histone molecules form "beads on a string" consisting of nucleosomes in an extended configuration. 4. Nucleosomes are structures in the nucleus that are used to _____. (Concept 19.1 ) Your Answer: wrap the DNA to organize it and make it more compact Correct. DNA and histone molecules form "beads on a string" consisting of nucleosomes in an extended configuration. 5. Nucleosomes include all of the following histone proteins except _____. (Concept 19.1 ) Your Answer: H1 Correct. Histone H1 interacts with the nucleosomal DNA and helps bring adjacent nucleosomes together. 6. During interphase, chromatin can exist in the form of _____. (Concept 19.1 ) Your Answer: 10-nm fiber, 30-nm fiber, or looped domains Correct. The folding of the chromatin changes in different regions of the genome, with much of the chromatin existing as a 10-nm fiber and other regions undergoing higher- level packing. 7. During interphase, _____ can be seen with a light microscope. (Concept 19.1 ) Your Answer: heterochromatin Correct. Heterochromatin is chromosomal material that is tightly packed even when the cell is not dividing. 8. Active genes are associated with the loosely packed chromatin called _____. (Concept 19.1 ) Your Answer: euchromatin Correct. Euchromatin is loosely packed chromatin that generally contains active genes. 9....
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Ch. 19 Bio - Site Title: Campbell, BIOLOGY, 7th Edition...

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