Critical Thinking #4
The quotations are referring to the phases of interphase which is a phase of mitosis in the regeneration of a cell. By saying that you want to stop the gene from progressing from G1 to S or G2 to M you are saying that you want to hopefully stop the gene in the early phases of interphase before the DNA of the gene has begun to replicate.
Critical Thinking #5
Peroxisomes are the cellular organelles responsible for breaking down toxins. This means that they would be responsible for breaking down such chemical preservatives as phenol, formaldehyde, and alcohol.