The following nucleotide sequence is found on the template...

The following nucleotide sequence is found on the template strand of DNA. First, determine the amino acids of the protein encoded by this sequence by using the genetic code provided in Figure 15.10. Then give the altered amino acid sequence of the protein that will be found in each of the following mutations: (EQUATION CAN'T COPY) a. Mutant 1: A transition at nucleotide 11 b. Mutant 2: A transition at nucleotide 13 c. Mutant 3: A one-nucleotide deletion at nucleotide 7 d. Mutant 4: A T S A transversion at nucleotide 15 e. Mutant 5: An addition of TGG after nucleotide 6 f. Mutant 6: A transition at nucleotide 9

The following nucleotide sequence is found on the template strand of DNA. First, determine the amino acids of the protein encoded by this sequence by using the genetic code provided in Figure 15.10. Then give the altered amino acid sequence of the protein that will be found in each of the following mutations: (EQUATION CAN'T COPY)
a. Mutant 1: A transition at nucleotide 11
b. Mutant 2: A transition at nucleotide 13
c. Mutant 3: A one-nucleotide deletion at nucleotide 7
d. Mutant 4: A T S A transversion at nucleotide 15
e. Mutant 5: An addition of TGG after nucleotide 6
f. Mutant 6: A transition at nucleotide 9

Key Concepts

Reading Frame

The reading frame is the way nucleotides in mRNA are divided into consecutive, non-overlapping triplets (codons) for translation. Maintaining the correct reading frame is crucial, as even a single nucleotide insertion or deletion can shift the frame, leading to widespread misinterpretation of the codon sequence and producing aberrant proteins.

Frameshift Mutations

Frameshift mutations occur due to insertions or deletions of nucleotides that are not in multiples of three, which disrupts the normal reading frame of the mRNA. This alteration changes the grouping of codons downstream of the mutation, often leading to a completely different sequence of amino acids and frequently resulting in a nonfunctional protein or premature termination during translation.

Point Mutations

Point mutations involve a change of a single nucleotide in the DNA sequence. Within point mutations, there are transitions—where a purine is replaced by another purine or a pyrimidine by another pyrimidine—and transversions—where a purine is substituted for a pyrimidine or vice versa. These mutations may lead to changes in the codon that can be synonymous (no change in amino acid) or non-synonymous (change in amino acid), thereby potentially altering the protein's structure and function.

Transcription and Translation

Transcription is the process by which the DNA template strand is used to synthesize a complementary mRNA molecule. During translation, the mRNA is read in codons by the ribosome, which assembles the corresponding amino acids to form a protein. This process relies on the genetic code to accurately convert sequences of nucleotides into amino acid sequences.

Genetic Code

The genetic code is the set of rules by which the sequence of nucleotides in messenger RNA (mRNA) is translated into the sequence of amino acids in proteins. Each group of three nucleotides, known as a codon, corresponds to a specific amino acid or a stop signal during protein synthesis, and the code is nearly universal across organisms.

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