Question

question 15 of 20 :
select the best answer for the question.

1. how is dna copied?

a. each single strand of dna is used as a template to create a complementary strand of dna.

b. the antisense strand of dna is used as a template to create both strands of the new double helix.

c. the mrna made from the dna is used as a template to create a complementary strand of dna.

d. the sense strand of dna is used as a template to create both strands of the new double helix.

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Explanation:

DNA replication follows the semi - conservative model. In this process, the double - helix structure of DNA unwinds, and each of the two single strands acts as a template. DNA polymerase then adds complementary nucleotides to each template strand, creating a new complementary strand for each original strand. Option A correctly describes this process. Option B is incorrect because both strands (not just the antisense strand) serve as templates. Option C is incorrect as mRNA is involved in transcription and translation, not DNA replication. Option D is incorrect as both strands (not just the sense strand) are used as templates.

Answer:

A. Each single strand of DNA is used as a template to create a complementary strand of DNA.