AnswerKeyPractice_Qs

AnswerKeyPractice_Qs - BCH 228, Spring 2011 Greenleaf...

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BCH 228, Spring 2011 Greenleaf Practice questions from old exams 1 These questions are from previous exams. Because the material was previously presented in BCH 227, the relevant questions were extracted from exams that also touched upon other topics. Note that most of the questions in Prob Set AG-1 were also from old exams. Duke blue = correct 1. Which of these words describes a property of the genetic code? Circle correct letter(s). a) overlapping b) degenerate c) punctuated d) linear e) indeterminate 2. Bacterial RNA polymerase contains subunits called ß’, ß, σ , and α . a) In terms of these subunits, what is the composition of an actively elongating RNA polymerase in the middle of a transcription unit. ß’ß α 2 b) What is the subunit composition of RNA polymerase that binds to a promoter? ß’ß α 2 σ c) How many ATP equivalents are used in the transition from a closed to an open promoter complex? none (zero) d) Of the two mechanisms for transcription termination in bacteria, which do you think is more efficient energetically? Briefly, why? Factor independent. Unlike factor-dependent (rho-dependent) termination, it does not require additional ATP equivalents to be used up, beyond those used in synthesizing the transcript. 3. Which one of the following is not true of the mRNA for ovalbumin? A. Exons are used for polypeptide synthesis. B. Introns are complementary to their adjacent exons and will form hybrids with them. C. The mature mRNA is substantially shorter than the corresponding region on the DNA. D. The mRNA is originally synthesized in the nucleus, but ends up in the cytoplasm. E. The splicing that yields a mature mRNA occurs at very specific sites in the RNA primary transcript.
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BCH 228, Spring 2011 Greenleaf Practice questions from old exams 2 4. Translation factor EF-Tu•GTP binds all aa-tRNAs except one. One function of this binding
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This note was uploaded on 03/28/2012 for the course BIOCHEM 228 taught by Professor Greenleaf during the Spring '12 term at Duke.

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AnswerKeyPractice_Qs - BCH 228, Spring 2011 Greenleaf...

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