(4) The attachment of the pyrimidine base to the ribose phosphate ring is catalyzed by orotate phosphoribosyl transferase (OPRT) and PRPP provides the ribose-5-phosphate moeity. Hydrolysis of the PP i that is split off of the PRPP makes this reaction irreversible.
Red Squirrels shed their coats twice a year, switching between a thinner coat in summer and a darker, thicker winter coat. 6. Males may live in an area of up to 17 hectares of woodland... thatâs about the same size as 34 football pitches! 7.
This simple, time-saving recipe lets you prepare winter root vegetables in advance for Thanksgiving dinner. Parboil parsnips, rutabaga, and carrots, freeze or refrigerate them until needed, then toss them with vegetable oil, salt, pepper, and dried basil before roasting them to bring out their natural sweetness.