GENETICS:ANALYSIS+PRIN.(LL)-W/ACCESS
6th Edition
ISBN: 9781260239775
Author: BROOKER
Publisher: MCG
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Chapter 21, Problem 17EQ
Summary Introduction
To review:
The functional significance of the glutamic acid in the protein sequence.
Introduction:
The development of the cloned DNA (deoxyribonucleic acid) segment which is mutated at a single site is termed as site-directed mutagenesis. The effect of a mutation can be observed on the organism. The nitrogen bases of the DNA that encode the information about the polypeptide or protein synthesis are mutated by using the changes in oligonucleotide sequence.
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Students have asked these similar questions
Although a large number of mutagenic chemicals are known,none is known that induces mutations in only a single gene(gene-specific mutagenesis). From what you know aboutmutagens, explain why it is unlikely that a gene-specificchemical mutagen will be found. How then is site-specificmutagenesis accomplished?
E17. Gene mutagenesis is also used to explore the structure and function
of proteins. For example, changes can be made to the coding
sequence of a gene to determine how alterations in the amino acid
sequence affect the function of a protein. Let's suppose that you are
interested in the functional importance of a particular glutamic acid
(an amino acid) within a protein you are studying. By site-directed
mutagenesis, you make mutant proteins in which this glutamic
acid codon has been changed to other codons. You then test the
encoded mutant proteins for functionality. The results are as follows:
Functionality (%)
Normal protein
100
Mutant proteins containing
Тугosine
Phenylalanine
3
Aspartic acid
94
Glycine
From these results, what would you conclude about the functional
significance of this glutamic acid within the protein?
Suppose a researcher previously cloned gene Y into M13 bacteriophage vector. Gene Y encodes a product called peptide Y. A
region of gene Y contains the DNA sequence ATG-CGC-GAA-CTG-GTG-AAC-TAA. The researcher wishes to change a Val
residue to an Ala residue in this region of peptide Y using site-directed mutagenesis.
What should be the sequence of the mutant oligonucleotide primer in this region? You may use a codon table.
mutant oligonucleotide primer sequence:
GGC-GGC-GAA-CTG-GTG-AAC-TAA
Incorrect
Chapter 21 Solutions
GENETICS:ANALYSIS+PRIN.(LL)-W/ACCESS
Ch. 21.1 - 1. Which of the following may be used as a vector...Ch. 21.1 - The restriction enzymes used in gene-cloning...Ch. 21.1 - 3. Which is the proper order of the following...Ch. 21.1 - 4. The function of reverse transcriptase is...Ch. 21.1 - A collection of recombinant vectors that carry...Ch. 21.2 - Prob. 1COMQCh. 21.2 - Prob. 2COMQCh. 21.2 - 3. During real-time PCR, the synthesis of PCR...Ch. 21.3 - When a dideoxyribonucleotide is incorporated into...Ch. 21.4 - 1. The purpose of site-directed mutagenesis and...
Ch. 21.5 - Which of the following methods use(s) a labeled...Ch. 21.5 - 2. Which of the following methods is used to...Ch. 21.5 - During Western blotting, the primary antibody...Ch. 21.6 - 1. In an EMSA, the binding of a protein to...Ch. 21.6 - The basis for DNase I footprinting is that the...Ch. 21 - Discuss three important advances that have...Ch. 21 - Prob. 2CONQCh. 21 - Write a double-stranded DNA sequence that is 20...Ch. 21 - What is cDNA? In eukaryotes, how does cDNA differ...Ch. 21 - 5. Draw the structural feature of a...Ch. 21 - Prob. 1EQCh. 21 - Prob. 2EQCh. 21 - Describe the important features of cloning...Ch. 21 - 4. How does gene cloning produce many copies of a...Ch. 21 - Prob. 5EQCh. 21 - Prob. 6EQCh. 21 - Prob. 7EQCh. 21 - Prob. 8EQCh. 21 - Prob. 9EQCh. 21 - Starting with a sample of RNA that contains the...Ch. 21 - 11. What type of probe is used for real-time PCR?...Ch. 21 - 12. What phase of PCR (exponential, linear, or...Ch. 21 - 13. DNA sequencing can help us to identify...Ch. 21 - A sample of DNA was subjected to automated DNA...Ch. 21 - Prob. 15EQCh. 21 - Prob. 16EQCh. 21 - Prob. 17EQCh. 21 - Prob. 18EQCh. 21 - Prob. 19EQCh. 21 - What is the purpose of a Northern blotting...Ch. 21 - Prob. 21EQCh. 21 - Prob. 22EQCh. 21 - 23. In the Western blot shown here, proteins were...Ch. 21 - If you wanted to know if a protein was made during...Ch. 21 - Prob. 25EQCh. 21 - Prob. 26EQCh. 21 - Prob. 27EQCh. 21 - 28. Describe the rationale behind the...Ch. 21 - Certain hormones, such as epinephrine, can...Ch. 21 - An electrophoretic mobility shift assay can be...Ch. 21 - Prob. 31EQCh. 21 - Prob. 32EQCh. 21 - Prob. 33EQCh. 21 - Prob. 1QSDC
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Here is a eukaryotic gene. The numbers given are base pairs of exon and intron. How long in bases will the pre mRNA transcript be? Explain briefly. What is the maximum number of amino acids that could make up the protein product from the final mRNA? Explain briefly.arrow_forwardList three possible uses of site-directed mutagenesisarrow_forwardusing example what is a degenerate primer? with the aid of diagrams discuss how degenerate primers are used to introduce random mutations in a gene and list some advantages and disadvantages of generating modified protein by this method .arrow_forward
- A molecular geneticist hopes to find a Gene in human liver cell that codes for an important blood-clotting protein,he knows that the nucleotide sequence of a small part of the Gene is GTGGACTGACA.briefly explain how to obtain genearrow_forwardTranscribe and translate the mutated sequence #1. Determine the consequence, if any, for each mutation. You will need to use your codon charts in your ISN. Practice with both charts.arrow_forwardA molecular geneticist hopes to find a gene in human liver cells that codes for an important blood-clotting protein. He knows that the nucleotife sequence of a small part of the gene is GTGGACTGACA. Briefly explain how to obtain the desired gene.arrow_forward
- Biochemistry: Site-directed mutagenesis, in which individual amino acid residues are replaced with others, is a powerful method to study enzyme mechanisms. In experiments with particular enzyme, various lysine residues were replaced with aspartate, yielding the results summarized in the table below: Enzyme Form: Enzyme Activity (U/mg) Native enzyme: 1,000 U/mg Recombinant Lys 21 to Asp 21: 970 U/mg Recombinant Lys 86 to Asp 86: 100 U/mg Recombinant Lys 101 to Asp 101: 970 U/mg a. What might be inferred about the role of Lys 21, 86, and 101 in the catalytic mechanism of this enzyme? b. Discuss where within the enzyme one might find Lys 21 and 101. Are these residues likely to be evolutionary conserved in this enzyme? Explain c. Is Lys position 86 likely to be evolutionary conserved? Explainarrow_forwardSuppose that the diagram below represents the genomic organization of an enzyme involved in eye pigment production in mice. Within the gene are four exons. Biochemical analysis has revealed that the active site of the enzyme is located in the C terminus of the protein. -The nucleotide length of each exon and intron is shown. -The dinucleotide sequence GT represents the 5’ splice site and the dinucleotide sequence AG represents the 3’ splice site. Both the 5’ and the 3’ splice sites must be present for splicing to occur. Assume that the first and second stop codons are located immediately after the first and second 5’ splice sites, respectively; the third and fourth stop codons are located near the 3’ end of exons 3 and 4, respectively; all these stop codons are in the correct reading frame. a) draw what the processed mRNA will look like. Include the start codon on the mRNA and label the approximate locations of the 5’ UTR and 3’ UTR on the transcript. (You do not need to add the 5’ CAP…arrow_forwardA molecular geneticist hopes to find a gene gene in human liver cells that codes for an important blood clotting protein. He knows that the nucleotides sequence of a small part of the gene is GTGGACTGACA. briefly explain how to obtain the desired genearrow_forward
- Explain how site-directed mutagenesis can be used to produce an altered protein in bacterial cells.arrow_forwardSilent mutations that occur in DNA are quite common in living cells and usually involve no effects on phenotype. In not more than 2 pages (using 1.5 line space of Arial or Times New Roman fonts) provide answers for the following questions? 1) Define the silent mutation in DNA? 2) What is the codon usage bias? 3) Provide one example of a clinical implication of a “silent mutation” that proven to have an effect on the phenotype andprovide a brief description of its molecular characteristics? (Explain in details)arrow_forwardWhile characterizing a mutation in a gene of interest, you discover that the mutation involves an insertion within the coding sequence of the gene. You suspect that the inserted sequence is a transposon and would like to determine which of the three major transposon families it belongs to. What sequence elements could be looked for within the inserted sequence that would help place it in one of the three families?arrow_forward
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