What is an active site and what is its relationship to an enzyme? an active site in an enzyme is the area that breaks the bond in its substrate. E.g. a maltose molecule's glycocide bond is broken by the active site in a maltase enzyme.
The caffeine in a cup of coffee might help your small blood vessels work better. Credit: Â© jogyx / Fotolia. The caffeine in a cup of coffee might help your small blood vessels work better, according to research presented at the American Heart Association's Scientific Sessions 2013.
CONS: Coffee drinkers who have more than three cups a day may increase their risk of heart attack, a U.S. study in 2006 found. âAfter around three cups of coffee, your heart will beat noticeably faster, raising blood pressure slightly,â explains Dr Schenker. And bizarrely, drinking just three cups of a coffee a day may make some womenâs breasts shrink, according to researchers from Lund University in Stockholm.