For Each of the Following Sentences, Fill in the Blanks

Essay

For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below.Not all words or phrases will be used; use each word or phrase only once.
$\begin{array}{llcc} \text { DNA sequencing} & \text { polymerase chain reaction } \\ \text { DNA ligase } &\text { recombinant DNA} \\ \text { endonucleases} &\text {restriction enzymes } \\ \text {gel electrophoresis } &\text { ribonucleases } \\\end{array}$

Nucleases that cut DNA only at specific short sequences are known as __________.DNA composed of sequences from different sources is known as __________.__________ can be used to separate DNA fragments of different sizes.Millions of copies of a DNA sequence can be made entirely in vitro by the __________ technique.