CH_12 - UCGA AG TC CH 12 1 Prototrophs(original eaters grow...

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UCGA AG TC CH 12 1. Prototrophs (“original eaters”) grow on minimal media, whereas _______ (“increased eaters”) require specific additional nutrients. Answer: auxotrophs 2. The basic units of DNA and RNA molecules are the _______. Answer: nucleotides 3. RNA differs from DNA in base composition in that it contains _______ instead of thymine. Answer: uracil 4. The strand of DNA that is transcribed into RNA is the _______ strand. Answer: template 5. The part of a protein that determines whether translation will continue in the cytosol or at the endoplasmic reticulum is the _______ sequence. Answer: signal 6. The excess of codons (64) over amino acids (20) indicates that the genetic code is _______. Answer: redundant 7. An mRNA molecule with several ribosomes attached at the same time is called a(n) _______. Answer: polysome 8. Small ribosomal subunits are dispersed into smaller components when placed into a detergent solution. Upon removal of the detergent, the components interact to create new intact subunits by a process called _______. Answer: self-assembly 9. A mutation that causes a change in the nitrogenous base sequence of a DNA molecule but no change in the amino acid sequence it codes for is called a(n) _______ mutation. Answer: silent 10. The fact that some tRNA molecules do not have to pair exactly is called _______. Answer: wobble 11. The portion of the tRNA molecule that complementary base-pairs with the mRNA is called the _______.
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Answer: anticodon 12. The lethal toxin that is produced by the castor bean plant and that blocks protein synthesis is _______. Answer: ricin 13. The one-gene, one-enzyme hypothesis resulted from the work of ______. Answer: Beadle and Tatum 14. The synthesis of DNA from RNA is called _______. Answer: reverse transcription 15. A tRNA that has bonded to an amino acid is referred to as _______ tRNA. Answer: charged Multiple Choice 1. After irradiating Neurospora , Beadle and Tatum collected mutants that require arginine to grow. These mutants a. will not grow on minimal media but will grow on minimal media with arginine. b. will grow on minimal media and on minimal media with arginine. c. will not grow on minimal media and will not grow on minimal media with arginine. d. will grow on minimal media but will not grow on minimal media with arginine. e. None of the above Answer: a 2. Within a group of mutants with the same growth requirement (i.e., the same overt phenotype), mapping studies determined that individual mutations were on different chromosomes. This indicates that a. the same gene governs all the steps in a particular biological pathway. b. different genes can govern different individual steps in the same biological pathway. c. different genes govern the same step in a particular biological pathway.
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This note was uploaded on 11/29/2011 for the course BIOLOGY BIO 187 taught by Professor Capco during the Spring '11 term at ASU.

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CH_12 - UCGA AG TC CH 12 1 Prototrophs(original eaters grow...

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