Given the damage caused by UV, the kind of gene affected in those ...

[aero]

Given the damage caused by UV, the kind of gene affected in those with XP is one whose product is involved with
A) mending of double-strand breaks in the DNA backbone.
B) breakage of cross-strand covalent bonds.
C) the ability to excise single-strand damage and replace it.
D) the removal of double-strand damaged areas.
E) causing affected skin cells to undergo apoptosis.

[Hawke]

I'd go with C. It makes sense.

[aero]

Just got my test back, you're right!

[xMRAZ]

Thank you!