A Level Biology Practice Exam

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What describes the process of DNA replication?

  1. the creation of RNA from DNA

  2. the semi-conservative production of identical DNA copies

  3. the breakdown of DNA into nucleotides

  4. the fusion of two DNA molecules

The correct answer is: the semi-conservative production of identical DNA copies

The process of DNA replication is accurately described by the semi-conservative production of identical DNA copies. During replication, each of the two strands of the original DNA molecule serves as a template for the formation of a new complementary strand. This means that each resulting DNA molecule contains one original strand and one newly synthesized strand, hence the term "semi-conservative." This mechanism ensures that the genetic information is accurately preserved and passed on during cell division, which is vital for growth, development, and maintenance of organisms. The other options describe processes that do not accurately reflect the nature of DNA replication. Creating RNA from DNA refers to transcription, while breaking down DNA into nucleotides pertains to degradation processes, and the fusion of two DNA molecules involves genetic recombination or molecular cloning methods, rather than replication.

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