A) Heat to 70°C (to bind primers and enzymes), then cool to 50°C (to synthesize DNA), and then reheat to 90°C (to separate DNA).
B) Heat to 70°C (to separate DNA), then cool to 50°C (to bind primers and enzymes), and then reheat to 90°C (to synthesize DNA).
C) Heat to 90°C (to separate DNA), then cool to 50°C (to bind primers and enzymes), and then reheat to 70°C (to synthesize DNA).
D) Heat to 90°C (to bind primers and enzymes), then cool to 50°C (to separate DNA), and then reheat to 70°C (to synthesize DNA).

A) noncircular DNA segments found only in bacteria.
B) chromosomal loops made of RNA.
C) small, replicating rings of DNA found in bacteria.
D) found only in three species of bacteria.
E) necessary for bacteria to reproduce.

A) creating humans with higher intelligence levels.
B) generating economic benefits.
C) improving agriculturally important food plants.
D) efficiently producing biologically important molecules.
E) treating disease more effectively.