PCR can be used to selectively duplicate one single gene out of thousands because the only primers available to start replication are the one unique pair that are complementary to the regions on both sides of the gene. Which of these primers (one for each strand) could you use to copy just the stretch (enlarged) of the amelogenin gene that differs between the X and Y chromosomes

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .

a bird that nests only in a particular tree species.