Where does HDL in the body come from?
The small intestine
The pancreas
The liver
The gallbladder
The Correct Answer is C
A. The small intestine absorbs lipids but does not produce HDL (high-density lipoprotein).
B. The pancreas produces enzymes and hormones, but it does not produce HDL.
C. The liver is the primary organ responsible for the synthesis of HDL. HDL is involved in reverse cholesterol transport, carrying cholesterol from tissues back to the liver.
D. The gallbladder stores and concentrates bile but does not produce HDL.
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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.
Correct Answer is D
Explanation
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.