(a) Write what DNA replication refers to.
(b) State the properties of DNA replication model.
(c ) List any three enzymes involved in the process along with their functions.

Explanation

(a) DNA replication refers to synthesis of DNA
(b) The two strands of DNA separate and act as template for the synthesis of new complementary strands. After the completion of replication each DNA molecule would have one parental and one newly synthesised strand le.. DNA replication is semiconservative. It is continuous on one strand and discontinuous on the other strand as replication occurs only in 5'- 3' direction. The replication does not initiate randomly at any place in DNA. It starts at definite regions called origin of replication For long DNA molecules, since the two strands of DNA cannot be separated in its entire length (due to very high energy requirement). the replication occurs within a small opening of the DNA helix, referred to as replication fork.
(c ) 1. DNA polymerase III-adds nucleotides
2. RNA primase - adds RNA primer
3. Helicase-breaks hydrogen bonds and separates two DNA strands
4. Gyrase - relaxes supercoiling
5. DNA ligase-Joins Okazaki fragments