In the Mismatch Repair pathway, how does the repair machinery distinguish between the “old” template strand (which has the correct sequence) and the “new” daughter strand (which contains the copying error)?

Which of the following is an example of a spontaneous mutation rather than an induced mutation?

In the BER pathway, a group of scanning enzymes called DNA glycosylases find irregularities, flip out the faulty nucleotide, and cleave it away via hydrolysis. Why must a cell express multiple, different types of glycosylases?

The antiviral drug acyclovir is a base analog structurally similar to deoxyguanosine. It is highly effective at stopping the herpes virus from replicating in infected human cells, yet it leaves the patient’s surrounding, non-replicating healthy cells relatively unharmed. Why are the patient’s healthy, non-dividing tissue cells largely unaffected by the drug?

A researcher exposes a bacterial culture to a flat, hydrophobic aromatic dye. This molecule drives mutations by physically wedging itself directly between adjacent, stacked base pairs of the double helix, causing the DNA backbone to stretch, unwind, and distort. When the replication machinery attempts to copy this stretched template, what is the most likely structural consequence to the resulting mRNA reading frame?

Why is Homologous Recombination (HR) considered an “error-free” high-fidelity repair mechanism for double-strand breaks compared to Non-Homologous End Joining (NHEJ)?

A research team treats a lineage of human cells with a chemical inhibitor that selectively blocks the activity of Histone Deacetylases (HDACs). What is the expected epigenetic impact of this drug on the targeted chromatin architecture and downstream gene expression?

A scientist treats a DNA strand with a chemical that induces a transversion. Which of the following single-nucleotide base swaps would be observed?

A chromosomal rearrangement occurs where a broken segment of a chromosome is accidentally copied a second time and inserted right next to the original piece. What is this type of mutation called, and what is its primary danger to the cell?

If a source file solar_calc.c is compiled like this: ‘gcc solar_calc.c’, what is the executable file named?