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Multiple Choice
DNA is replicated through which method?
A
Conservative replication
B
Nonconservative replication
C
Dispersive replication
D
Semiconservative replication
Verified step by step guidance
1
Understand the concept of DNA replication: DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules. This is crucial for cell division and inheritance.
Learn about the semiconservative model: In semiconservative replication, each of the two parental DNA strands serves as a template for new strands. After replication, each DNA molecule consists of one original strand and one newly synthesized strand.
Differentiate between replication models: Conservative replication would result in one molecule with two old strands and another with two new strands. Dispersive replication would produce DNA strands that are a mix of old and new DNA segments.
Recognize the experimental evidence: The Meselson-Stahl experiment provided strong evidence for semiconservative replication by using isotopic labeling to show that DNA molecules after replication contained one old and one new strand.
Conclude with the significance: Semiconservative replication ensures genetic consistency across generations, as each new cell receives an exact copy of the DNA, preserving genetic information.