DNA replication yields two double-stranded molecules via base pairing

Steps:

• The double helix unwinds, separating into two template strands.
• Each template strand directs synthesis of a complementary strand.
• Incoming nucleotides align via base pairing (A-T, G-C).
• Two complete double-stranded DNA molecules form, each with one old and one new strand.

Why B is correct:

• Complementary base pairing (adenine-thymine, guanine-cytosine) links nucleotides in each new DNA strand, per Watson-Crick model.

Why the others are wrong:

• A: Specifies "molecules" accurately but errs on "paired sequence of nucleotides"; pairing involves bases, not whole nucleotides.
• C: Identical to B but listed separately; no unique distinction, making it redundant.
• D: Uses "strands" instead of "molecules" and incorrectly claims pairing of nucleotides rather than bases.

Final answer: B