Science / Genetics / Endonuclease Restriction Enzyme: A protein that recognizes specific, short nucleotide sequences and cuts dna at those sites. Bacteria contain over 400 such enzymes that recognize and cut more than 100 different dna sequences.
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Restriction Noun Synonyms: condition, provision, proviso, qualification, stipulation
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Science / Biology / One Gene, One Enzyme Hypothesis: Holds that a single gene controls the production, specificity, and activity of each enzyme in a metabolic pathway. Thus, mutation of such a gene changes the ability of the cell to carry out a particul MORE
Science / Genetics / Macrorestriction Map: Map depicting the order of and distance between sites at which restriction enzymes cleave chromosomes. MORE
Science / Genetics / Long-Range Restriction Mapping: Restriction enzymes are proteins that cut dna at precise locations. Restriction maps depict the chromosomal positions of restriction-enzyme cutting sites. These are used as biochemical 'signposts,' or MORE
Business / Agriculture / Quantitative Restrictions: Quantitative restrictions are limitations on the quantity or value of a product that may be permitted to enter a country. They are probably the most familiar of the nontariff barriers and include quot MORE
Science / Genetics / Restriction Enzyme Cutting Site: A specific nucleotide sequence of dna at which a particular restriction enzyme cuts the dna. Some sites occur frequently in dna (e.g., every several hundred base pairs), others much less frequently (r MORE
Science / Genetics / Restriction-Enzyme Cutting Site: A specific nucleotide sequence of dna at which a particular restriction enzyme cuts the dna. Some sites occur frequently in dna (e.g., every several hundred base pairs): others much less frequently (r MORE