Beta-galactosidase At Biology Glossary
What is it? The enzyme that splits lactose into glucose and galactose (coded by a gene (lac z) in the lac operon of Escherichia coli).Bio Definition Added By: Gabrielle
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Bio Term Recombinant DNA is A molecule of DNA in which a DNA fragment from a different source has been inserted.Bio Term aneuploid is Individuals or cells exhibiting aneuploidy.
Bio Term Merodiploid is A partially diploid bacterium, carrying both its own chromosome and a chromosome fragment introduced by conjugation, transformation or transduction.
Bio Term allozyme is Form of an enzyme that differs in amino acid sequence, as shown by electrophoretic mobility or some other property, from other forms of the same enzyme and is encoded by one allele at a single locus. See isozymes.
Bio Term downstream is A convention used to describe features of a DNA sequence, gene or mRNA related to the position and direction (5 to 3) of transcription by RNA polymerase or translation by the ribosome. Downstream (or 3 to) is in the direction of transcription (or translation) whereas upstream (5 to) is in the direction from which the polymerase (or ribosome) has come. Conventionally DNA sequences, gene maps and RNA sequences are drawn with transcription (or translation) from left to right and so downstream is towards the right.