The term semiconservative replication refers to the fact that each new DNA molecule resulting from the replication process is "half-old, half-new." In the diagram, complete the replication required in the middle of the molecule by adding the required letters representing the missing nucleotide bases. Recall
that ATP energy and the appropriate enzymes are actually required to complete this process.

1. A

2. C

3. T

4. G

5. G

6. G

7. T

8. G

9. A

10. C

11. C

12. C

Explanation:

As stated in this question, Semi-conservative model of DNA replication is the acceptable model of replication in which the two synthesized molecules of DNA consists of one new and one old strand each. DNA replication is carried out by an enzyme called DNA polymerase.

In the semi-conservative model, a double stranded DNA separates into two single strands. Each single strand is used as a template for DNA polymerase to synthesize nucleotides based on complementary base pairing i.e. For every Adenine base, Thymine is added and for every Guanine, Cytosine is added and vice versa.

In this question showing an image of a DNA molecule undergoing replication using semiconservative model, the first DNA molecule consists of the following nucleotides on the old strand and its synthesized nucleotides on the new strand:

Old strand - New strand

1. T - A

2. G - C

3. A - T

4. C - G

5. C - G

6. C - G

On the second DNA molecule, we have the following nucleotides on the old strand and its synthesized nucleotides on the new strand.

Old strand - New strand

7. A - T

8. C - G

9. T - A

10. G - C

11. G - C

12. G - C