Question

how is genetic information conserved during dna replication?
a. a single strand of dna forms from small fragments of mrna.

b. a single strand of dna binds to a complementary mrna strand.

c. the two newly formed strands of dna join together to form a new double helix.

d. each newly formed dna strand joins with an original dna strand to form a new double helix.

Explanation:

To solve this, we analyze each option based on DNA replication knowledge:

• Option A: DNA replication uses DNA templates, not mRNA fragments to form DNA strands. Eliminate A.
• Option B: Binding of DNA to mRNA is part of transcription/translation, not DNA replication. Eliminate B.
• Option C: DNA replication is semi - conservative, meaning new DNA has one old and one new strand, not two new strands. Eliminate C.
• Option D: DNA replication is semi - conservative. Each new double helix consists of one original (old) strand and one newly synthesized strand, which conserves genetic information.

Answer:

D. Each newly formed DNA strand joins with an original DNA strand to form a new double helix.