Pyrimidine biosynthesis is allosterically inhibited by ATP. a. requires an intermediate found in urea biosynthesis. b. does not require ATP hydrolysis. c. involves synthesizing the base while it is attached to ribose.

requires an intermediate found in urea biosynthesis

Explanation:

Both pyrimidine and urea are carbon and nitrogen containing compounds. Carbamoyl phosphate provides both carbon and nitrogen in biosynthesis pathways of both pyrimidine and urea. Hence, it is an intermediate in both the pathways.

In urea biosynthesis carbamoyl phosphate provides its carbamoyl group to ornithine. In pyrimidine synthesis it donates the carbamoyl group to aspartate. Carbamoyl phosphate synthetase synthesizes carbamoyl phosphate by joining ammonium ions to carbon dioxide and adenosine triphosphate.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion