Biology 181 - exam3_2005_post

Biology 181 - exam3_2005_post - Biology 181 Sections 1 2H 3...

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1 Biology 181, Sections 1, 2H, 3, 4H Drs. Richard Hallick and William Grimes Exam 3, Nov. 9, 2005 VERSION ONE 1) What was the main result of the Hershey and Chase experiment to confirm previous evidence that DNA is the genetic material: a) DNA from heat killed S strain converted the R strain of pneumococcus into the deadly S strain b) when infecting bacteria, virus particles with either radioactive proteins or radioactive DNA injected only DNA into the bacteria c) following several generations of growth in 15 N containing media, bacteria transferred to 14 N containing media prove that DNA is replicated semiconservatively when cells divide d) when DNA is destroyed by injecting an enzyme into cells, the S phase of the cell cycle is blocked e) damaging DNA by X-rays results in the loss of specific enzymes that function in metabolic pathways inside cells 2) In the process of DNA replication, the strand that must be replicated by producing short fragments of DNA is the: a) leading strand b) lagging strand c) non-coding strand d) template strand e) RNA strand 3) In the Meselson-Stahl experiment, what percent of the DNA was composed of 1 light strand and 1 heavy strand after two generations of growth in 14 N containing media? a) 25 b) 50 c) 75 d) 100
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2 e) none 4) During DNA replication, the template is read _______ and the new strand is synthesized ___________. a) 5' to 3'; 5' to 3' b) 5' to 3'; 3' to 5' c) 3' to 5'; 3' to 5' d) 3' to 5'; 5' to 3' e) both are 5' to 3' or 3' to 5' 5) What amino acid does the anticodon 5'-UAA cause to be placed in a growing polypeptide chain? a) none, UAA is a stop codon b) serine, ser c) alanine, ala d) glutamine, gln e) leucine, leu 6) If the coding or template strand of DNA has 3 "C" nucleotides and 3 "T" nucleotides, and the non-coding strand has two "C" and 2 "T" nucleotides, you would expect the mRNA to have: a) 3 "G" and 2 "U" nucleotides b) 3 "A" and 2 "C" nucleotides c) 3 "G" and 2 "T" nucleotides d) "a" and "b" e) "a", "b", and "c" 7) Which of the following is the correct RNA sequence that would be transcribed from the DNA template; 5'- AGCCTGATCCGAT? a) 5'- AGCCTGATCCGAT b) 3'- AGCCTGATCCGAT c) 5'- AUCGGAUCAGGCA d) 3'- UCGGACUAGGCUA e) 5'- ATCGGATGAGGCT 8) Which step in protein synthesis insures that the coding information in nucleic acids is correctly converted to a sequence of amino acids? a) DNA replication b) the addition of the correct amino acid to a tRNA by an aminoacyl tRNA synthetase c) RNA transcription d) G protein mediated entry of tRNAs into the ribosomal complex e) G protein mediated release of the polypeptide from the ribosome tRNA complex 9) If a mRNA contains 102 nucleotides, including the AUG start codon and the UGA stop codon, how many amino acids would you expect to find in the resulting protein? a)
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This note was uploaded on 11/15/2009 for the course BIO 181 taught by Professor Jorstad during the Spring '07 term at Arizona.

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Biology 181 - exam3_2005_post - Biology 181 Sections 1 2H 3...

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