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				| 1. | What are the inputs to one cycle of urea cycle? | 
| A. | One molecule of CO2, one molecule of ammonia, three molecules of ATP and one molecule of aspartic acid | 
| B. | One molecule of urea, one molecule of AMP, two molecules of ADP and one molecule of fumaric acid | 
| C. | One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid | 
| D. | Two molecules of urea, two molecules of ammonia, one molecule of ATP and one molecule of fumaric acid | 
| Answer» B. One molecule of urea, one molecule of AMP, two molecules of ADP and one molecule of fumaric acid | |