Unformatted text preview: 14. What is a gene? What are some of the problems with your definition? 15. The gene for the human protein albumin spans a chromosomal region 25,000 nucleotide pairs (25 kilo- bases, or kb) long from the beginning of the protein-coding sequence to the end of the protein- coding sequence, but the messenger RNA for this pro- tein is only 2.1 kb long. What do you think accounts for this huge difference? 16. DNA is extracted from cells of Neurospora, a fungus that has one set of seven chromosomes; pea, a plant that has two sets of seven chromosomes; and house- fly, an animal that has two sets of six chromosomes. If powerful electrophoresis is used to separate the DNA on a gel, how many bands will each of these three species produce? 17. Devise a formula that relates size of RNA to gene size, number of introns, and average size of introns. 18. If a codon in mRNA is UUA, draw the tRNA anti- codon that would bind to this codon. 19. Two mutations arise in separate cultures of a nor- mally red fungus (which has only one set of chromo- somes). The mutations are found to be in differentsomes)....
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.
- Spring '08