(a)[5]
Describe how DNA replication takes place.
(b)[1]
State the name of the chromosome region that stops genes being lost during DNA replication.
(c)[2]
Some glycoproteins in cell surface membranes act as transport proteins. State two additional functions of glycoproteins in cell surface membranes.
(c(i))[1]
A transversion event is when a pyrimidine is incorporated into the newly made strand in place of a purine, or vice versa. Name the two bases that could replace cytosine in a transversion event.
(c(ii))[2]
A transition event is when an incorrect purine is inserted or an incorrect pyrimidine is inserted. Suggest why transversion events are less likely to happen than transition events.
(d)[3]
Outline how mutations can turn healthy cells into tumour cells.