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- 1. Multiple ChoiceDNA fingerprinting works becauseMost genes are dominantAll organisms contain RNAThe most important genes are different among most peopleNo two people, except identical twins, have exactly the same DNA
- 2. Multiple ChoiceWhat is the purpose of gel electrophoresis?helps cut DNAcount the genes in DNAseparates DNA based on sizeallows for an exact replicated organism
- 3. Multiple ChoiceWhy do the fragments of DNA in gel electrophoresis travel away from the negative electrode?DNA is negatively charged so attracted to the positive end of the unitDNA is positively charged to attracted to the negative end of the unitthe agarose gel in negatively chargedthe agarose gel is positively charged
- 4. Multiple ChoiceWhich is the primary purpose of using restriction enzymes in gel electrophoresis?It allows the strands of DNA to be cut into various lengths for testingIt restricts the number of base pairs that can be tested in a sampleIt makes the testing simpler by moving the strands into the gel fasterIt charges the DNA strands
- 5. Multiple Choice
A student performed a gel electrophoresis experiment. The results are represented in the diagram
below. Compared to the fragments at the top of the gel, the fragments at the lower end are
larger, and move slower
larger, and move faster
smaller, and move faster
smaller, and move slower
- 6. Multiple Choice
Once DNA has been extracted from the nucleus of a cell, it is exposed to ______ ______ that act like biochemical scissors to cut the DNA.
restriction enzymes
gel agarose
clotting factors
electric shock
- 7. Multiple ChoiceGel electrophoresis enables scientists toseparate DNA fragments.combine DNA fragments.count the genes in DNA.insert DNA in cells.
- 8. Multiple ChoiceDuring gel electrophoresis, DNA moves from the ___ end to the ___ end.positive, negativenegative, positive
- 9. Multiple Choice
How are buffers used in Electrophoresis?
Conduct electricity
Remove salts
Add extension energy
Dissolve excess DNA
- 10. Multiple ChoiceWhat type of bonds hold the two strands of DNA together?Hydrogen bondsCovalent bondsDipole-Dipole bondsIonic bonds
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