Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 9, Problem 13P
Third-base wobble allows some
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Three E. coli tRNA molecules with the anticodon sequences CGG, OGG , and UGG are charged with the same amino acid. What is the amino acid ?
Codons in the set CUU, CUC, CUA, and CUG all code for the amino acid leucine. In this set, the first and second bases are identical; the identity of the third base is irrelevant. For what other sets of codons is the third base also irrelevant? For what amino acid(s) does each set code?
In the tertiary structure of tRNA, where is the anticodon region relative to the attachment site for the amino acid? Are these located adjacent to each other?
Chapter 9 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Ch. 9 - 9.1 Some proteins are composed of two or more...Ch. 9 - In the experiments that deciphered the genetic...Ch. 9 - 9.3 Several lines of experimental evidence pointed...Ch. 9 - Outline the events that occur during initiation of...Ch. 9 - 9.5 A portion of a DNA template strand has the...Ch. 9 - Describe three features of tRNA molecules that...Ch. 9 - Prob. 7PCh. 9 - For each of the anticodon sequences given in the...Ch. 9 - What is the role of codons UAA, UGA and UAG in...Ch. 9 - Compare and contrast the composition and structure...
Ch. 9 - Consider translation of the following mRNA...Ch. 9 - Prob. 12PCh. 9 - Third-base wobble allows some tRNAs to recognize...Ch. 9 - The genetic code contains 61 codons to specify the...Ch. 9 - 9.15 The three major forms of (,, and ) interact...Ch. 9 - The accompanying figure contains sufficient...Ch. 9 - 9.17 The line below represents a mature eukaryotic...Ch. 9 - 9.18. After completing Problem, carefully draw a...Ch. 9 - 9.19 Define and describe the differences in the...Ch. 9 - 9.20. Describe the roles and relationships...Ch. 9 - 9.21 In an experiment to decipher the genetic...Ch. 9 - Identify and describe the steps that lead to the...Ch. 9 - Prob. 23PCh. 9 - Har Gobind Khorana and his colleagues performed...Ch. 9 - 9.25 An experiment by Khorana and his colleagues...Ch. 9 - Prob. 26PCh. 9 - 9.27 The mature transcribed from the human gene is...Ch. 9 - Prob. 28PCh. 9 - Prob. 29PCh. 9 - Prob. 30PCh. 9 - 9.31 A portion of the coding strand of for a gene...Ch. 9 - A eukaryotic mRNA has the following sequence. The...Ch. 9 - Diagram a eukaryotic gene containing three exons...Ch. 9 - Prob. 34PCh. 9 - 9.35 Table lists and gene sequences for or ...Ch. 9 - Prob. 36PCh. 9 - In terms of the polycistronic composition of mRNAs...Ch. 9 - Prob. 38PCh. 9 - 9.39 Answer the following questions about the...Ch. 9 - 9.40 for each of the following anticodon...Ch. 9 - Prob. 41PCh. 9 - Prob. 42P
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- Indicate the amino acid sequence of the protein encoded by the following mRNA molecule. Use the genetic code table and assume that the very first “AUG” the ribosome encounters will serve as the start codon and specify methionine. 5’-AAUUCAUGCCCAAAUUUGGGGCACGAAGCUUCUUAGGCUAGUCCUAAAAAA-3’arrow_forwardUsing the codon given for each amino acid (Find the table yourself) write the base sequence of mRNA that would translate the synthesis of the following pentapeptide:Arg · Ile · Cys · Tyr · Valarrow_forwardOrnithine is structurally similar to lysine except ornithine’s side chain is one methylene group shorter than that of lysine. Attempts to chemically synthesize and isolate ornithinyl-tRNA proved unsuccessful. Propose a mechanistic explanation. (Hint: Six-membered rings are more stable than sevenmembered rings.)arrow_forward
- Several experiments were conducted to obtain information about how the eukaryotic ribosome recognizes the AUG start codon. In one experiment, the gene that encodes methionine initiator tRNA (tRNAiMet) was located and changed; specifically, the nucleotides that specify the anticodon on tRNAiMet were mutated so that the anticodon in the tRNA was 5′ –CCA–3′ instead of 5′ CAU–3′. When this mutated gene was placed in a eukaryotic cell, protein synthesis took place, but the proteins produced were abnormal. Some of these proteins contained extra aminoacids, and others contained fewer amino acids than normal. a. What do these results indicate about how the ribosome recognizes the starting point for translation in eukaryotic cells? Explain your reasoning. b. If the same experiment had been conducted on bacterial cells, what results would you expect? c. Explain why some of the proteins produced contained extra amino acids while others contained fewer amino acids than normal.arrow_forwardThe following RNA sequence represents a small messenger which can be translated in a prokaryotic cell: 5'-ACGAAUGCACAGUAAAACUGGCUAGCGUAGGCUGA-3 Assume that the messenger RNA is translated in the cell, using the correct machinery and signals required for accurate protein synthesis. Using this RNA sequence and the Genetic Code Dictionary (see your textbook for the dictionary), solve the following problems A. Write the sequence of a protein that would be translated from this mRNA, using the appropriate stop and start signals, and indicating the correct termini of the protein product. B. Suppose that the underlined A in the sequence is changed to a U. Write the expected protein product of this mRNA.arrow_forwardIn HbS, the human hemoglobin found in individuals with sickle-cell anemia, glutamic acid at position 6 in the beta chain is replaced by valine. Q.) Show that one of the glutamic acid codons can be converted to a valine codon by a single substitution mutation (i.e., by changing one letter in one codon).arrow_forward
- One of the codons in mRNA that specifies the amino acid phenylalanine is UUC. What is the anticodon on the tRNA that carries phenylalanine?arrow_forwardA tRNA has an anticodon sequence 3′–GGU–5′. What amino acid does it carry?arrow_forwardSeveral experiments were conducted to obtain information about how the eukaryotic ribosome recognizes the AUG start codon. In one experiment, the gene that encodes methionine initiator tRNA (tRNAiMet) was located and changed; specifically, the nucleotides that specify the anticodon on tRNAi Met were mutated so that the anticodon in the tRNA was 5′ –CCA–3′ instead of 5′ –CAU–3′. When this mutated gene was placed in a eukaryotic cell, protein synthesis took place, but the proteins produced were abnormal. Some of these proteins contained extra amino acids, and others contained fewer amino acids than normal. a. What do these results indicate about how the ribosome recognizes the starting point for translation in eukaryotic cells? Explain your reasoning. b. If the same experiment had been conducted on bacterial cells, what results would you expect? c. Explain why some of the proteins produced contained extra amino acids while others contained fewer amino acids than normalarrow_forward
- A tRNA has an anticodon sequence 3′– GGU–5′. Identify the amino acidit is carrying?arrow_forwardThe wobble pairing rule states that a 'U' in teh anticodon wobble position can pair with 'A' or 'G', whereas a 'C' in the wobble position of the anticodon can only pair with 'G'. what is the anticodon found on the Methionine tRNA?arrow_forwardSeveral experiments were conducted to obtain information about how the eukaryotic ribosome recognizes the AUG start codon. In one experiment, the gene that encodes methionine initiator tRNA (tRNAiMet) was located and changed; specifically, the nucleotides that specify the anticodon on tRNAiMet were mutated so that the anticodon in the tRNA was 5′ –CCA–3′ instead of 5′ –CAU–3′. When this mutated gene was placed in a eukaryotic cell, protein synthesis took place, but the proteins produced were abnormal. Some of these proteins contained extra amino acids, and others contained fewer amino acids than normal. Q. If the same experiment had been conducted on bacterial cells, what results would you expect?arrow_forward
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