What type of mutation is this? normal: ACT TGA AAG
Mutated: ACT TCA AAG
A Frameshift Mutation
B Point Mutation
C Nonsense Mutation
DChromosomal Mutation

b. point mutation

Explanation:

Guanine was substituted with Cytosine in the mutated sequence

lysosome is this part of the cell is surrounded by a very thick outer membrane to protect the rest of the cell from its strong enzymes.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.