1) A swab is usually taken by forensic scientists from which part of the body? a) outer cheek b) inside the mouth c) inside the nose d) blood 2) The type of cell extracted using a mouth swab are .... a) red blood cells b) nerve cells c) epithelial cells d) pancreatic cells 3) The cells in the mouth epithelial layer are ideal for DNA isolation because.... a) dense in nuclei and DNA b) easily undergo division c) very large containing lots of cytoplasm d) easily detached from the mouth surface 4) What substance was added to the cell sample to isolate the DNA? a) sugar b) vinegar c) chlorophyll d) salt 5) The reason why detergent solution was added to the salt water and cell sample. a) destroys the cell walls b) allows the DNA to precipitate out of solution c) breaks down the cell membranes d) disintegrates the DNA 6) The reason why ethanol was added to the salt water and cell sample. a) destroys the cell walls b) allows the DNA to precipitate out of solution c) breaks down the cell membranes d) disintegrates the DNA 7) Identify the form of gel used in gel electrophoresis. a) hydrogel b) agar c) gelatin d) hair 8) In gel electrophoresis the samples are placed into the ... a) holes b) dimples c) wells d) electrodes 9) In gel electrophoresis the negative electrode is attached to the end where you will find the... a) power pack b) agar gel c) DNA samples d) buffer 10) Identify the voltage run through the gel. a) 3 V b) 6 V c) 36V d) 63V 11) Identify the physical property that the fragments are separated by in gel electrophoresis. a) mass b) size c) age d) concentration 12) In gel electrophoresis, small DNA fragments will a) not move very far b) travel far c) not move at all

DNA in forensics

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