Below on the left is a diagram of double-stranded dna of a circular plasmid from a bacterial cell. the positions x, y, and z are sites where the plasmid dna is cleaved by restriction enzymes x, y, and z, respectively. the numbers are the size in kilobase pairs (kb) of the dna regions between the restriction sites. on the right is a diagram of an electrophoresis gel. lane 1 is the ladder, comprised of dna fragments that range in size from 1–12 kb showing the position of each band size after electrophoresis. the other lanes are dna bands observed from digestion of the plasmid with one of more of the restriction enzymes.

1. seamount a raised footwall block between normal fault creates this 2. syncline break between rocks where a hanging wall rises relative to a footwall 3. hot spring on rolling hills, this a dip between hills 4. volcanic neck created when a block with hanging walls slips down between normal faults 5. caldera underwater volcano that never reaches above sea level 6. horst natural hot water on earth's surface containing many minerals 7. graben underwater volcano whose top is eroded flat by waves 8. crater less than a mile in diameter; looks like a bowl at the top of a volcano 9. guyot magma that filled the central vent that remains after the volcano has eroded 10. reverse fault over 1 mile in diameter; looks like a bowl over a volcano