Question

the dark blue lines represent the original dna strands; the light blue lines represent dna strands that were synthesized using those original strands as a template. the arrows represent dna being transformed to rna. two rounds of replication are shown here. the double helix that results from replication can be described as: one old strand, one new strand.

Explanation:

• The first statement is correct as it aligns with the semi - conservative replication model where new strands are synthesized using old strands as templates.
• The second statement is incorrect because the arrows represent DNA replication (producing new DNA), not transcription (DNA to RNA).
• The third statement is correct. Starting from one double - helix, after the first round of replication, there are 2 double - helices, and after the second round, there are 4, which is two rounds of replication.
• The fourth statement is correct as it describes the semi - conservative nature of DNA replication.

Answer:

• The dark blue lines represent the original DNA strands; the light blue lines represent DNA strands that were synthesized using those original strands as a template.
• Two rounds of replication are shown here.
• The double helix that results from replication can be described as: "One old strand, one new strand."