(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.
Recycle Umbrellas into Rain Coats For Dogs! Itâs raining cats and dogs and I just put a poncho on my poodle. Recycling Zychal takes old broken umbrellas and uses the fabric to make adorable and fashionable rain gear for dogs!