mc chapter 18 test

Mc chapter 18 test - CHAPTER 18 AP BIOLOGY NAME SCORE DATE MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers

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CHAPTER 18 AP BIOLOGY NAME: ____________________ DATE:_____________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The compacted chromosomes observed in mitosis are due to A) tandemly repetitive DNA. B) coiling, looping, and folding of DNA. C) coiling of chromatin. D) looped domains. E) DNA winding around histones. 2) The fundamental form of chromatin is A) repeating, noncoding sequences of DNA. B) four "beads" consisting of DNA wrapped around eight histone molecules. C) cleavage. D) degradation of unnecessary proteins. E) successive levels of DNA packing. 3) In a nucleosome, what is the DNA wrapped around? A) nucleolus protein B) histones C) ribosomes D) mRNA E) polymerase molecules 4) All of the following statements concerning the eukaryotic chromosome are true except that A) it consists of a single molecule of DNA wound around nucleosomes. B) the nucleosome is the structural subunit. C) gene expression is controlled by the histones. D) it is composed of DNA and protein. E) active transcription occurs on euchromatin. 5) If a cell were unable to produce histone proteins, which of the following would be expected? A) Pseudogenes would be transcribed to compensate for the decreased protein in the cell. B) The cell's DNA couldn't be packed into its nucleus. C) Spindle fibers would not form during prophase. D) The amplification of other protein genes would compensate for the lack of histones. E) There would be an increase in the amount of "satellite" DNA produced during centrifugation. 6) Which of the following represents an order of increasingly higher levels of organization? A) 30-nanometer chromatin fiber, nucleosome, looped domain B) looped domain, nucleosome, 30-nanometer chromatin fiber C) nucleosome, looped domain, 30-nanometer chromatin fiber D) nucleosome, 30-nanometer chromatin fiber, looped domain E) looped domain, 30-nanometer chromatin fiber, nucleosome 7) Which of the following statements is true ? SCORE
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CHAPTER 18 AP BIOLOGY A) Heterochromatin is composed of DNA, while euchromatin is made of DNA and RNA. B) Euchromatin is not transcribed while heterochromatin is transcribed. C) Only euchromatin is visible under the light microscope. D) Both heterochromatin and euchromatin are found in the nucleus. E) Heterochromatin is highly condensed, while euchromatin is less compact. 8) Approximately what proportion of the DNA in humans does not produce a protein or a functional RNA? A) 17% B) 54% C) 68% D) 97% E) 87% 9) Most of the DNA in eukaryotic chromosomes is A) organized into operons. B) Alu elements. C) tandemly repetitive DNA. D) transposons. E) moderately interspersed. 10) Which of the following is not a characteristic of triplet-repeat disorders like Huntington's disease? A) The number of repeats tends to correlate with the severity of the disease.
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This note was uploaded on 02/07/2011 for the course BIO 121 taught by Professor Laghinh during the Spring '11 term at University of Florida.

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Mc chapter 18 test - CHAPTER 18 AP BIOLOGY NAME SCORE DATE MULTIPLE CHOICE Choose the one alternative that best completes the statement or answers

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