Why does NHEJ require nucleases to chew up DNA, if its goal is to rejoin DNA?

In the pathway shown below, the GC to TA mutation occurs because

O6-methylguanine can incorrectly pair with

Which is TRUE regarding MutT?

What process may lead to gene conversion between two alleles?

If adenine is deaminated into hypoxanthine it can

Which of the following is FALSE regarding dsDNA breaks?

Fraternal twins can sometimes fuse into a single person. This is called

A large number of GC to AT mutations seen in p53 result from

Radiation from ______ can create cyclobutane rings in DNA and prevent proper base pairing.