▁television ▁actors ▁Category : L iving ▁people ▁Category : 1 9 8 8 ▁birth s ▁Category : G ay ▁actors ▁Category : Ident ical ▁tw in ▁male ▁actors ▁Category : L GB T ▁people ▁from ▁California ▁Category : 2 1 st - century ▁American ▁male ▁actors ▁Category : L GB T ▁entertain ers ▁from ▁the ▁United ▁States ▁Category : M ale ▁actors ▁from ▁San ▁Francisco ▁Category : American ▁male ▁film ▁actors ▁Category : T win ▁people ▁from ▁the ▁United ▁States <0x0A> </s> ▁Rib oz ym es ▁( rib on uc le ic ▁acid ▁en zym es ) ▁are ▁R NA ▁mole cules ▁that ▁have ▁the ▁ability ▁to ▁catal y ze ▁specific ▁bio chem ical ▁re actions , ▁including ▁R NA ▁sp lic ing ▁in ▁gene ▁expression , ▁similar ▁to ▁the ▁action ▁of ▁protein ▁en zym es . ▁The ▁ 1 9 8 2 ▁discovery ▁of ▁rib oz ym es ▁demonstrated ▁that ▁R NA ▁can ▁be ▁both ▁gen etic ▁material ▁( like ▁DNA ) ▁and ▁a ▁bi ological ▁catal yst ▁( like ▁protein ▁en zym es ), ▁and ▁contributed ▁to ▁the ▁R NA ▁world ▁hypothesis , ▁which ▁suggests ▁that ▁R NA ▁may ▁have ▁been ▁important ▁in ▁the ▁evolution ▁of ▁pre bi otic ▁self - rep lic ating ▁systems . ▁The ▁most ▁common ▁activities ▁of ▁natural ▁or ▁in ▁vit ro - e vol ved ▁rib oz ym es ▁are ▁the ▁cle av age ▁or ▁lig ation ▁of ▁R NA ▁and ▁DNA ▁and ▁pe pt ide ▁bond ▁formation . ▁Within ▁the ▁rib os ome , ▁rib