Why does dna polymerase can't synthesize the ends of linear dna?

Why does the skin of your finger shrink when you wash clothes for a long time?

As a small change in a person's dna can cause a genetic disorder

Ras is a g-protein that is activated when a growth factor attaches to egfr. its activation results in the replacement of a gdp molecule with a gtp molecule, thus allowing a signal transduction pathway to be activated. considering the signal pathway illustrated on this page, what is one potential outcome of a mutation in the ras gene that leads to ras protein hyperactivity. be specific.