(a)[3]
Fill in the table by adding a tick (✓) in the appropriate column to show the process in which each substance may be used.
(b(i))
Describe how the two DNA strands are bonded together and state which part of each strand is joined by this bonding.
(b(ii))[4]
How does the strength of this bonding affect the mechanism of DNA replication?
(c)[3]
Some diseases result from alterations in the structure of proteins. Explain the genetic basis for these alterations.