Question

1. what rule is used to join the free nucleotides to the exposed bases of the dna? 14. this type of replication is called semi - conservative replication. considering the meaning of these words (semi—half; conserve—to keep), explain why dna replication is called semi - conservative.

Explanation:

For question 13, in DNA replication, the base - pairing rule (A - T and G - C) is used to join free nucleotides to the exposed bases of the DNA. Adenine (A) pairs with thymine (T) and guanine (G) pairs with cytosine (C).
For question 14, in semi - conservative replication, each new DNA molecule consists of one original (conserved) strand and one newly synthesized strand. So, half of the original DNA molecule is conserved in each new molecule.

Answer:

1. The base - pairing rule (A - T and G - C).
2. Because each new DNA molecule has one original strand (half of the original DNA is conserved) and one new strand.