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Question

The restriction enzymes are used in genetic engineering because they

A
Can degrade harmful proteins
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B
Can join different DNA fragments
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C
Can cut DNA at specific base sequence
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D
Are nucleases that cut RNA at variable sites
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Solution

The correct option is B Can cut DNA at specific base sequence
The goal of genetic engineering is changing the genetic makeup of an organism. To achieve this goal, scientists must have a way of rearranging genes to create new combinations of DNA. Restriction enzymes are one tool that can be used to accomplish this goal. A restriction enzyme or restriction endonuclease is an enzyme that cuts DNA at or near specific recognition nucleotide sequences known as restriction sites. To cut DNA, all restriction enzymes make two incisions, once through each sugar-phosphate backbone (i.e., each strand) of the DNA double helix.
Therefore, the correct answer is option C.

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