What is a common breakdown product between amp and gmp degradation to uric acid?

The correct answer is "Xanthine".

Explanation:

Xanthine are molecules that participate as a product on the pathway of degradation of AMP and GMP to uric acid. Xanthine are purine based and are found in most human body fluids. Xanthine oxidase (XO) is the enzyme that catalyzes both degradation pathways, and trough a series of reactions AMP and GMP are degraded into hypoxanthine or xanthine.

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation:

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.