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A point mutation in a gene can change a single nucleotide in the DNA sequence, which can lead to a different amino acid being incorporated into the protein during translation. This can alter the structure and function of the protein, potentially affecting its ability to perform its normal role in the cell.
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Why is is it possible for a point mutation to have no affect on the protein produced?
A point mutation can have no effect on the protein produced if it occurs in a non-coding region of the gene, such as an intron. In coding regions (exons), silent mutations can also occur where the mutation leads to a codon that still codes for the same amino acid, preserving the protein's function. Additionally, some amino acid substitutions might not impact the protein's structure or function due to redundancy in the genetic code or similarities in amino acid properties.
How might a point mutation in a gene impact the structure and function of the resulting protein?
A point mutation in a gene can change a single nucleotide in the DNA sequence, leading to a different amino acid being incorporated into the protein during translation. This can alter the structure of the protein, affecting its shape and potentially disrupting its function. The change in amino acid sequence may also impact the protein's ability to interact with other molecules or perform its intended role in the cell.
How might an error during transcription affect the protein that is produced?
The protein might be unable to function.
If one of the nitrogen bases were replaced by a different base what effect might that have on protein synthesis?
It depends. Because many amino acids have more than one codon, it may not affect the protein at all. However, if it does change the amino acid sequence, it could cause a change in the three-dimensional structure of the protein, resulting in a mutation.
What might happen to the stop codon in a frameshift mutation?
In a frameshift mutation, the stop codon may be altered or shifted, potentially leading to a change in the reading frame of the genetic code. This can result in the formation of a different protein or a longer protein than intended, affecting the normal functioning of the cell.
Why is is it possible for a point mutation to have no affect on the protein produced?
A point mutation can have no effect on the protein produced if it occurs in a non-coding region of the gene, such as an intron. In coding regions (exons), silent mutations can also occur where the mutation leads to a codon that still codes for the same amino acid, preserving the protein's function. Additionally, some amino acid substitutions might not impact the protein's structure or function due to redundancy in the genetic code or similarities in amino acid properties.
How might an error during transcription affect protein that is produced?
The protein might be unable to function.
How might a point mutation in a gene impact the structure and function of the resulting protein?
A point mutation in a gene can change a single nucleotide in the DNA sequence, leading to a different amino acid being incorporated into the protein during translation. This can alter the structure of the protein, affecting its shape and potentially disrupting its function. The change in amino acid sequence may also impact the protein's ability to interact with other molecules or perform its intended role in the cell.
How might an error during transcription affect the protein that is produced?
The protein might be unable to function.
If one of the nitrogen bases were replaced by a different base what effect might that have on protein synthesis?
It depends. Because many amino acids have more than one codon, it may not affect the protein at all. However, if it does change the amino acid sequence, it could cause a change in the three-dimensional structure of the protein, resulting in a mutation.
How might a mutation in the regulator gene affect the lac operon?
A mutation in the regulator gene of the lac operon can disrupt the production or function of the repressor protein that normally inhibits the operon in the absence of lactose. If the mutation leads to a non-functional repressor, the operon may be constitutively expressed, resulting in unnecessary enzyme production even when lactose is not present. Conversely, a mutation that enhances repressor function could prevent the operon from being activated when lactose is available, impairing the cell's ability to utilize lactose as an energy source. Overall, such mutations can significantly impact the regulation of gene expression in response to environmental changes.
How might protein synthesis execute differently if a mutation occurs?
A mutation can alter the sequence of DNA, causing changes in the mRNA produced during transcription. This can result in the insertion, deletion, or substitution of amino acids in the protein sequence during translation. These changes can impact the structure and function of the protein, potentially leading to a non-functional or altered protein being produced.
What might happen to the stop codon in a frameshift mutation?
In a frameshift mutation, the stop codon may be altered or shifted, potentially leading to a change in the reading frame of the genetic code. This can result in the formation of a different protein or a longer protein than intended, affecting the normal functioning of the cell.
If a mutation occurred during the formation of a protein that substituted an amino acid with a reactive R group for one that had a nonreactive R group how might this affect the reactivity?
A mutation is a change in DNA, so when u change the DNA this affects the sequence of the amino acid in the primary structure. this later changes the folding of the r groups because u don't have the right unique sequence of amino acid that was encoded by the DNA
If a human mRNA were placed into a cell of yeast it would be?
recognized by the yeast ribosomes, translated into protein, and the resulting protein might or might not function properly within the yeast cell, depending on the compatibility of the human protein with the yeast cellular machinery.
How a change in the sequence of nucleotides in a strand of DNA might cause a protein to malfunction?
A change in the DNA sequence, such as a point mutation, can result in a different amino acid being incorporated into the protein during translation. This can alter the protein's structure, possibly affecting its function or leading to improper folding. In some cases, the mutation may introduce a premature stop codon, resulting in a truncated and non-functional protein.
How might a point mutation in a gene affect the reasulting protein?
point mutations include substitutions insertions and deletions of a single nuceotide in DNA. CONSIDER: insertions and deletions have a greater effect on proteins that do substiutions because insertions and deletions affect every amino acid that is specified by the nucleotides that follow the point of mutation CONSIDER: a substitution affects a single amino acid a change in more than one amino acid is more likely to alter the ability of the protein to function narmally than is a change in a single amino acid CONSIDER: follow me on twitter @Rocco_Gone_Ham
