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Practice Questions Answers Dr. Johnson DGD

Practice Questions Answers Dr. Johnson DGD - Updated DNA...

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Updated April 14, 2010 DNA, RNA structure and function Why are multiple copies of tRNA and rRNA genes needed? a. These RNAs are destroyed very rapidly. b. These RNAs are very stable. c. These RNAs are needed in large amounts. d. These RNAs do not benefit from the extra amplification step that occurs for protein- encoding genes. e. c and d mRNA molecules, once transcribed are translated simultaneously by many ribosomes, leading to amplified product (require few mRNA to yield large desired end product) rRNA and tRNA: once transcribed have function If you treat mitotic chromosomes with solutions that extract histones, what happens? a. The chromosomes become more condensed. b. The DNA separates into two single strands instead of remaining as a double helix. c. Histone-free DNA can be seen to extend outward as loops from a protein scaffold. d. The chromosomes precipitate. e. The chromosomes become branched What postulates that the state and activity of a particular region of chromatin depends upon the specific modifications, or combination of modifications, to the histone tails in that region? It suggests that the pattern of modifications adorning the tails of the core histones contains encoded information governing the properties of the nucleosomes containing them. a. the DaVinci code b. the chemiosmotic hypothesis c. the histone code d. the genetic code e. the endosymbiotic hypothesis Q: For DNA structure, more compact structures are based upon simpler structures. Explain what this means. Hierarchical structure Nucleosome (histone plus DNA) basic unit, H1 brings nucleosomes together 10nm fibre 30nm chromatin fibre (solenoid) chromosome Higher levels of structure are based upon the levels of structure established previously
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Replication Which type of replication results in 2 duplexes made of one parental strand and one newly synthesized strand? a. semiconservative replication b. conservative replication c. dispersive replication d. incisive replication e. reservative replication In eucaryotes replication moves out from the origin in ________ directions and is said to be ________.
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