Restriction enzymes<span>, also known as </span>restriction endonucleases<span>, are </span>enzymes<span> that cut a DNA molecule at a particular place. They are essential tools for recombinant DNA technology. The </span>enzyme<span> "scans" a DNA molecule, looking for a particular sequence, usually of four to six nucleotides.</span>
Answer:The cell membrane controls the movement of substances in and out of cells and organelles. In this way, it is selectively permeable to ions and organic molecules.
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