The process of genetic engineering usually involves altering the DNA of an organism so that .
A.
one element in the DNA ladder is replaced by another
B.
one segment of the DNA ladder is replaced by another
C.
one atom in the DNA ladder is replaced by another
D.
one bond in the DNA ladder is replaced by another

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

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.