EBK ESSENTIALS OF GENETICS
9th Edition
ISBN: 9780134190068
Author: Palladino
Publisher: YUZU
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Chapter 12, Problem 14PDQ
A glycine residue exists at position 210 of the tryptophan syn-thetase enzyme of wild-type E. coli. If the codon specifying glycine is GGA, how many single-base substitutions will result in an amino acid substitution at position 210, and what are they? How many will result if the wild-type codon is GGU?
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A glycine residue is in position 210 of the tryptophan synthetase enzyme of wild-type E. coli. If the codon specifying glycine is GGA, how many single-base substitutions will result in an amino acid substitution at position 210? What are they? How many will result if the wild-type codon is GGU?
By base-pair substitution, what are all the synonymouschanges that can be made starting with the codon CGG?
In studies of the amino acid sequence of wild-type and mutant forms of tryptophan synthetase in E. coli, the following changes have been observed: Determine a set of triplet codes in which only a single-nucleotide change produces each amino acid change.
Chapter 12 Solutions
EBK ESSENTIALS OF GENETICS
Ch. 12 - CASE STUDY | A drug that sometimes works A...Ch. 12 -
CASE STUDY | A drug that sometimes works
A...Ch. 12 -
CASE STUDY | A drug that sometimes works
A...Ch. 12 - HOW DO WE KNOW? In this chapter, we focused on the...Ch. 12 - Review the Chapter Concepts list on p. 215. These...Ch. 12 - In studies of frameshift mutations, Crick,...Ch. 12 -
4. The mRNA formed from the repeating...Ch. 12 - In studies using repeating copolymers, AC......Ch. 12 - Prob. 6PDQCh. 12 - Prob. 7PDQ
Ch. 12 -
8. When the amino acid sequences of insulin...Ch. 12 - Prob. 9PDQCh. 12 - Why doesn't polynucleotide phosphorylase (Ochoa's...Ch. 12 - Refer to Table 12.1. Can you hypothesize why a...Ch. 12 -
12. Predict the amino acid sequence produced...Ch. 12 - A short RNA molecule was isolated that...Ch. 12 - A glycine residue exists at position 210 of the...Ch. 12 - Shown here is a theoretical viral mRNA sequence...Ch. 12 -
16. Most proteins have more leucine than...Ch. 12 - Define the process of transcription. Where does...Ch. 12 - Describe the structure of RNA polymerase in...Ch. 12 - In a written paragraph, describe the abbreviated...Ch. 12 - Messenger RNA molecules are very difficult to...Ch. 12 - One form of posttranscriptional modification of...Ch. 12 - In a mixed copolymer experiment, messages were...Ch. 12 -
23. Shown in this problem are the amino acid...Ch. 12 - Alternative splicing is a common mechanism for...Ch. 12 - The genetic code is degenerate. Amino acids are...
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- Suppose the codon sequence GCCAUUCAAGCGGAU has a single base pair mutation to GCCAUUCAAACgGAU. If the old protein sequence was Ala-Ile-Gln-Ala-Asp, what will be the new sequence encoded by the mutant gene? _________(Use the 3-letter amino acid abbreviations with hyphens and no spaces in between, i.e. Ser-Asn-Tyr-Learrow_forwardA. What amino acid sequence is encoded by the codon sequence AUAAUGGUAACGGUU? B. Suppose the codon sequence AGACACUCUAUUAAA has a single base pair mutation to AGACACUCUUUUAAA. If the old protein sequence was Arg-His-Ser-Ile-Lys, what will be the new sequence encoded by the mutant gene?arrow_forwardCodons 24 to 66 represent an intron. At what point in the process of protein synthesis are introns removed? What is the name of the enzyme responsible for removing them?arrow_forward
- It is possible for the codons for a single amino acid to have the first two bases in common and to differ in the third base. Why is this experimental observation consistent with the concept of wobble?arrow_forwardA normal hemoglobin protein has a glutamic acid at position 6; in sickle-cell hemoglobin, this glutamic acid has been replaced by a valine. List all the possible mRNA codons that could be present for each type of hemoglobin. Can a single base change result in a change from Glu to Val in hemoglobin?arrow_forwardThe amino acid glycine is encoded by four codons: GGA, GGC, GGG, and GGU. Which of the following statements correctly explains this fact? The glycine anticodon contains the sequence CC, but the 5' base of the anticodon can pair nonspecifically with the 3' base of the codon. The glycine anticodon contains the sequence CC, but the 3' base of the anticodon can pair nonspecifically with the 5' base of the codon. Glycine tRNA has four anticodons, and the appropriate anticodon specifically pairs with the correct codon. There are four tRNAs for glycine, each of which has an anticodon that specifically pairs with the correct codon. all of the abovearrow_forward
- Suppose the codon sequence GUGCAAUUCGAGGCC has a single base pair mutation to GUGCAAUUCAAGGCC. If the old protein sequence was Val-Gln-Phe-Glu-Ala, what will be the new sequence encoded by the mutant gene? ____________________________.arrow_forwardLactose permease, a protein of E. coli, is composed of a single polypeptide that is 417 amino acids in length. By convention, the amino acids within a polypeptide are numbered from the aminoterminus to the carboxyl-terminus. Are the following questions about lactose permease true or false? A. Because the 64th amino acid is glycine and the 68th amino acid is aspartic acid, the codon for glycine, 64, is closer to the 3′ end of the mRNA than the codon for aspartic acid, 68. B. The mRNA that encodes lactose permease must be greater than 1241 nucleotides in length.arrow_forwardIf a codon GCA codes for the amino acid alanine in a prokaryote, what will it code for in a eukaryote? _____arrow_forward
- Consider the tryptophan codon 5′ - UGG - 3′ in the standard genetic code . Can a single base change in this codon create a synonymous mutation? Can a single base change in this codon create a nonsense codon?arrow_forwardWhy is wobble tolerated in the third position of the codon but not in the first two?arrow_forwardConsider the following wild-type and mutant sequences:Wild-type ....CTTGCAAGCGAATC....Mutant ....CTTGCTAGCGAATC....The substitution shown seems to have created a stop codon. What further information do you need to be confident that it has done so?arrow_forward
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