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Multiple Choice
Why are next-generation DNA sequencing technologies referred to as sequencing-by-synthesis?
A
Because they rely on synthesizing RNA from DNA templates.
B
Because they use chemical synthesis to create artificial DNA sequences.
C
Because they break down DNA into individual nucleotides before sequencing.
D
Because they synthesize a complementary DNA strand while detecting the sequence of nucleotides.
Verified step by step guidance
1
Understand the concept of sequencing-by-synthesis: This method involves synthesizing a new DNA strand complementary to the template strand while simultaneously detecting the sequence of nucleotides being added.
Recognize the role of DNA polymerase: In sequencing-by-synthesis, DNA polymerase is used to add nucleotides to the growing DNA strand, which is complementary to the template strand.
Identify the detection mechanism: As each nucleotide is incorporated into the new strand, a signal is generated (often through fluorescence or other detectable markers) that allows the identification of the specific nucleotide added.
Differentiate from other sequencing methods: Unlike methods that break down DNA into individual nucleotides or rely on synthesizing RNA, sequencing-by-synthesis focuses on real-time detection during the synthesis of a complementary strand.
Apply this understanding to the problem: The correct answer is that next-generation DNA sequencing technologies are referred to as sequencing-by-synthesis because they synthesize a complementary DNA strand while detecting the sequence of nucleotides.