Which protein sequence corresponds to the normal gene DNA sequence?

The correct choice reflects the normal protein sequence that corresponds directly to a specific DNA sequence based on the genetic code. Proteins are synthesized through the translation of messenger RNA (mRNA), which is transcribed from DNA. The sequence of amino acids in a protein is determined by codons in the mRNA, where each codon corresponds to a triplet of nucleotides in the DNA.

In this case, the sequence provided in the correct answer contains a logical order of amino acids that represents a complete and correctly formed polypeptide chain, which is likely derived from the transcription of exons in a gene. This choice also highlights the appropriate arrangement of amino acids that would be expected in a functional protein.

When considering the sequences offered in the other choices, they differ either in the composition or in the order of amino acids, which could suggest mutations or variations from the normal genetic sequence. This indicates that they do not accurately represent the standard protein structure encoded by the gene in question. Therefore, the normal protein sequence matching the gene DNA sequence is best represented by the choice provided, reinforcing the fidelity of gene expression.