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A by-product of protein catabolism is called__________.

A.

azotemia

B.

creatinine

C.

uric acid

D.

urea

Answer and Explanation

The Correct Answer is D

A. Azotemia is a condition characterized by elevated levels of nitrogenous waste products in the blood, not a direct by-product of protein catabolism.

 

B. Creatinine is a by-product of muscle metabolism, not directly from protein catabolism. 

 

C. Uric acid is a by-product of nucleic acid metabolism, not protein catabolism. 

 

D. Urea is a primary by-product of protein catabolism, formed in the liver and excreted by the kidneys. This is the correct answer.


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View Related questions

Correct Answer is A

Explanation

A. The bicarbonate, phosphate, and protein: The major chemical buffer systems in the body are the bicarbonate, phosphate, and protein buffer systems.

B. Glucose is not a buffering system; it is a primary energy source.

C. Magnesium is a mineral with various physiological roles but not a major chemical buffer system.

D. Creatinine is a waste product of muscle metabolism, not a buffer system.

Correct Answer is D

Explanation

A. Amino acids; proteins: Amino acids are the end products of protein digestion, not the substrates that are broken down.

B. Polysaccharides; amino acids: Polysaccharides are broken down into simple sugars (monosaccharides), not amino acids.

C. Proteins; nucleotides: Proteins are broken down into amino acids, not nucleotides. Nucleotides are components of nucleic acids, not proteins.

D. Nucleic acids; nucleotides: Nucleic acids (such as DNA and RNA) are broken down into nucleotides.

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