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Add alcohol and mix

DNA is unchanged

RNA is degraded into nucleotides c

Add alcohol and mix

DNA is unchanged

RNA is degraded into nucleotides r>

RNA fragments remain in solution

Centrifuge

Pellet of DNA

the RNA fragments is discarded (Fig. 21.02). The tiny pellet of DNA left at the bottom of the tube is often scarcely visible. Nonetheless, it contains billions of DNA molecules, sufficient for most investigations. This DNA is dissolved into buffered water and is now ready for use in genetic engineering.

Electrophoresis separates DNA and RNA on the basis of charge.

Gel electrophoresis separates nucleic acid molecules according to their molecular weight.

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