Question

In humans the sulphur of methionine and cysteine is excreted mainly as

Answer 1

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End-product sulfur (S) arises predominantly from the catabolism of the sulfur amino acids (SAA) methionine and cysteine. Sulfate and taurine are the two main S-containing end products and, once formed, they are excreted almost entirely in the urine (10–14).

Answer 2

In humans, the sulphur of methionine and cysteine is excreted mainly as an inorganic sulfate(urine).

Explanation:

• Inorganic sulfate is an essential and ubiquitous anion in human biology, but it is rarely studied in clinical chemistry today.
• Urinary excretion is the major disposal mechanism for excess sulfate produced by the oxidation of sulfur amino acids, and the kidney is the major regulatory site.
• Sulfate is a major urinary anion that has a significant affinity for cations and regulates the availability of cations that react with other anions in the urine.
• Therefore, it is an important factor in the urinary supersaturation of various crystals and stones such as calcium oxalate, hydroxyapatite, and blush stones.