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Multiple Choice
What determines the order of amino acids in the primary structure of a protein?
A
The interactions between R groups in the tertiary structure
B
The sequence of nucleotides in the gene encoding the protein
C
The presence of disulfide bonds between cysteine residues
D
The folding pattern of the protein's secondary structure
Verified step by step guidance
1
Understand that the primary structure of a protein refers to the linear sequence of amino acids in the polypeptide chain.
Recognize that the sequence of amino acids is determined by the sequence of nucleotides in the gene encoding the protein. Genes are composed of DNA, which contains codons (triplets of nucleotides) that specify particular amino acids during translation.
Learn that during transcription, the DNA sequence is converted into mRNA, which carries the codon sequence to the ribosome for translation.
During translation, the ribosome reads the mRNA codons and uses tRNA molecules to bring the corresponding amino acids, linking them together in the order specified by the mRNA sequence.
Clarify that while tertiary structure, disulfide bonds, and secondary structure are important for protein folding and function, they do not determine the primary sequence of amino acids. The primary sequence is solely dictated by the genetic code in the DNA.