Question

which statement is true about dna?
it is a single - stranded molecule.
both of the original dna strands act as templates during replication.
its replication takes place in the cytosol.
only one of the original dna strands acts as a template during replication.

Explanation:

• DNA is double - stranded, so the option "It is a single - stranded molecule" is wrong.
• DNA replication occurs in the nucleus (in eukaryotes) or nucleoid region (in prokaryotes), not in the cytosol, so "Its replication takes place in the cytosol" is wrong.
• In DNA replication, both original DNA strands act as templates (semi - conservative replication), so "Only one of the original DNA strands acts as a template during replication" is wrong and "Both of the original DNA strands act as templates during replication" is correct.

Answer:

B. Both of the original DNA strands act as templates during replication.