(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.
Answer by Bobleblob. Confidence votes 1. white-tailed Deer usually start growing their antlers in late spring to early summer. The velvet (the furry coating on the antler that makes the antler grow) is shed in early august and the antler is shed after the rut (deer mating season) in November.nswer by Bobleblob. Confidence votes 1. white-tailed Deer usually start growing their antlers in late spring to early summer. The velvet (the furry coating on the antler that makes the antler grow) is shed in early august and the antler is shed after the rut (deer mating season) in November.