# And.. Exercise1: Give the basic steps involved in extracting genomic DNA from animal cells and tossues?...

###### Question:

And..

Exercise1:

Give the basic steps involved in extracting genomic DNA from animal cells and tossues?

23- Which of the following statements is correct? a. Longer DNA fragments migrate farther than shorter fragments. b. Migration distance is inversely proportional to the fragment size. c. Positively charged DNA migrates more rapidly than negatively charged DNA. d. Uncut DNA migrates farther than DNA cut with restriction enzymes. 24- Why do scientists load DNA of known sizes (also called "marker" or "ladder") into the agarose gel? a. It makes it easier to determine sizes of unknowns using comparison techniques b. To fill in all the slots on the gel so you can run it c. To practice loading the DNA before you get to the important DNA b. So you know how long the gel needs to run 25 - Based on the following gel, what is the size of the band in lane 2?! a. 0.5:1.5 and 4 Kb b. 0.8; 1.9 and 4 Kb c.0.6; 1.6 and 4.2 Kb d. 0,6; 1 and 3.8 Kb IIIIIID- 26-Which of the following A260/280 ratios would be a reasonable cut off for RNA that you intend to use for quantitative RT-PCR? a. >1.8 b.31 c. 0.5 d. >3

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