BIO1140 Study Group #6 Answer Key

BIO1140 Study Group #6 Answer Key - BIO1140 Study Group #6...

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Unformatted text preview: BIO1140 Study Group #6 Answer Key 1. Fill in the blanks: i. A base is a purine or a pyridimine . ii. A base + a pentose sugar = _a nucleoside . iii. A nucleoside + a phosphate = _deoxynucleoside . 2. What is the role of histones in DNA organization? How does DNA packaging differ between bacteria, viruses and eukaryotes? Histones pack eukaryotic DNA at successive levels of organization i.e. hierarchical organization Viruses: Use basic proteins that may be part of the virus particle (capsid). Bacteria: Use basic proteins such as “HU”, “IHF”, “H-NS” to form a series of loops called a nucleoid . Eukaryotes: Use basic proteins called histones AND a hierarchical organization 3. Describe the bacterial chromosome and the eukaryotic chromosome, and how they differ. Bacterial Chromosome: Closed, circular molecule of DNA packed into nucleoid Replication begins from a single origin, proceeds in both directions Plasmids (in many bacteria) replicate independently of the host chromosome Eukaryotic Chromosomes:...
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This note was uploaded on 03/30/2012 for the course SCIENCE BIO1140 taught by Professor Fenwick during the Spring '09 term at University of Ottawa.

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BIO1140 Study Group #6 Answer Key - BIO1140 Study Group #6...

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