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Description: nonsense mutations add a stop codon, which stops translation at the site of the mutation. This makes the protein shorter for the wild type. true or false

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Biology

nonsense mutations add a stop codon, which stops translation at the site of the mutation. This makes the protein shorter for the wild type. true or false

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter13: Gene Expression

Section: Chapter Questions

Problem 12TYU

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A nonsense mutation is a substitution mutation that creates a chain-terminating codon in the mRNA corresponding to the mutant gene. Identify three substitution mutations that could change a tryptophan codon to a nonsense triplet.
A mutation is found in a tRNA-encoding gene. The wild type allele produces a tRNA that recognizes the codon GAA, and is charged with the amino acid Glutamic acid. The mutant tRNA is still charged with Glu, but the anticodon is mutated such that it recognizes the stop codon TAA. What effect will this have on translation in these cells? Select all that apply In the mutant cells, the stop codon TAA will always be bound by the release factors In the mutant cells, some of the synthesized proteins will be longer. O In the mutant cells, the stop codon TAA will sometimes be bound by the mutant TRNA charged with Glutamic acid. O In the mutant cells, some of the synthesized proteins will be shorter.
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A polypeptide has the following amino acid sequence: Met-Ser-Pro-Arg-Leu-Glu-Gly The amino acid sequence of this polypeptide was determined in a series of mutants listed in parts a through e. indicate the type of mutation that occurred in the DNA (single-base substitution, insertion, deletion) and the phenotypic effect of the mutation (nonsense mutation, missense mutation, frameshift, etc.). a. Mutant 5: Met-Ser-Pro-Arg-Leu-Leu-Glu-Gly
A polypeptide has the following amino acid sequence: Met-Ser-Pro-Arg-Leu-Glu-Gly The amino acid sequence of this polypeptide was determined in a series of mutants listed in parts a through e. indicate the type of mutation that occurred in the DNA (single-base substitution, insertion, deletion) and the phenotypic effect of the mutation (nonsense mutation, missense mutation, frameshift, etc.). a. Mutant 2: Met-Ser-Pro
A reversion is a mutation that returns a mutant codon back to acodon that gives a wild-type phenotype. At the DNA level, this typeof mutation can be an exact reversion or an equivalent reversion. An equivalent reversion produces a protein that is equivalent to thewild-type protein in structure and function. This outcome canoccur in two ways. In some cases, the reversion produces thewild-type amino acid (in this case, glutamic acid), but it uses adifferent codon than the wild-type gene. Alternatively, an equivalentreversion may substitute an amino acid structurally similarto the wild-type amino acid. In our example, an equivalent reversionhas changed valine to an aspartic acid. Because aspartic andglutamic acids are structurally similar—they are acidic aminoacids—this type of reversion can restore wild-type structure andfunction.Here is the question: The template strand within the codingsequence of a gene has the following sequence:3′–TACCCCTTCGACCCCGGA–5′This template produces the…
A polypeptide has the following amino acid sequence: Met-Ser-Pro-Arg-Leu-Glu-Gly The amino acid sequence of this polypeptide was determined in a series of mutants listed in parts a through e. indicate the type of mutation that occurred in the DNA (single-base substitution, insertion, deletion) and the phenotypic effect of the mutation (nonsense mutation, missense mutation, frameshift, etc.). a. MMutant 4: Met-Ser-Pro-Glu-Gl
A mutation is found in a tRNA-encoding gene. The wild type (non-mutant) allele (version) produces a tRNA that recognizes the codon GAA, and is charged with the amino acid glutamic acid (Glu). The mutant tRNA is still charged with Glu, but it recognizes the codon UAA. What effect will this have on translation in these cells? How will the proteins produced be different? Speculate: is this mutation more likely to be beneficial or harmful?
A polypeptide has the following amino acid sequence: Met-Ser-Pro-Arg-Leu-Glu-Gly The amino acid sequence of this polypeptide was determined in a series of mutants listed in parts a through e. For each mutant, indicate the type of mutation that occurred in the DNA (single-base substitution, insertion, deletion) and the phenotypic effect of the mutation (nonsense mutation, missense mutation, frameshift, etc.). a. Mutant 1: Met-Ser-Ser-Arg-Leu-Glu-Gly b. Mutant 2: Met-Ser-Pro c. Mutant 3: Met-Ser-Pro-Asp-Trp-Arg-Asp-Lys d. Mutant 4: Met-Ser-Pro-Glu-Gly e. Mutant 5: Met-Ser-Pro-Arg-Leu-Leu-Glu-Gly
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The code for a fully functional protein is actually coming from an mRNA transcript that has undergone post-transcriptional processing which is essentially way too different from the original code in the DNA template. Given: Val-His-Leu-Thr-Pro-Glu-Glu (Protein with known amino acid sequence) Requirement: Original DNA code. Itemize the steps you would take to get to know the original DNA code of the protein in focus.
An RNA polymer is made by using the enzyme polynucleotide phosphorylase with equal quantities of CTP and GTP. When this RNA is used in an in vitro translation system, all of the following amino acids could be incorporated into a newly made polypeptide, except: Codon Table Second position C UUU UCU UAU UGU phe tyr сys UUC UCC UAC UGC ser UAA Stop UGA Stop UAG Stop UGG trp UUA UCA UUG UCG CUU CCU CAU CGU leu his ССС pro ССА CỤC САС CGC arg CỦA САА CGA gln CUG CCG CAG CGG AUU ACU AAU AGU asn ser AUC ile ACC thr АCА AAC AGC AUA AAA lys AAG AGA arg AUG met ACG AGG GUU GCU GAU GGU asp GUC GCC ala GCA GẠC GGC val gly GUA GAA GGA glu GUG GCG GAG GGG glycine (Gly) histidine (His) proline (pro) alanine (Ala) arginine (Arg) Third position (3'-end) AGUCAG First position (5'-end)