Examlex
__________ is the beginning of menstruation.
Lactose
A sugar present in milk and dairy products, consisting of glucose and galactose units.
Transcription
The process by which the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA).
Allosteric Site
A region on an enzyme that binds to molecules in the cell, resulting in a change in the enzyme's activity; not the active site where substrate molecules bind.
Tryptophan Operon
A segment of DNA in bacteria that regulates the production of tryptophan by switching the genes responsible for its synthesis on or off.
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