Which organic molecule is broken down into the waste product urea?
Carbohydrates
Proteins
Lipids
Nucleic acids
The Correct Answer is B
A. Carbohydrates: Metabolized primarily to carbon dioxide and water, not urea.
B. Proteins: When amino acids are deaminated, nitrogen waste is produced; the liver converts this into urea, which is excreted in urine.
C. Lipids: Broken down into glycerol and fatty acids, metabolized for energy or stored, but they do not yield urea as waste.
D. Nucleic acids: Broken down into nitrogenous bases, which generate uric acid, not urea.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Subclavian vein: Drains the upper limb and ultimately feeds into the brachiocephalic veins and superior vena cava, which return blood to the right atrium.
B. Pulmonary vein: Carries oxygenated blood from the lungs to the left atrium, not the right atrium.
C. Inferior vena cava: Returns deoxygenated blood from the lower body directly into the right atrium.
D. Umbilical vein: In fetal circulation this returns oxygenated blood from the placenta to the fetus (and becomes a ligament after birth), so it does not return blood to the postnatal right atrium.
Correct Answer is B
Explanation
A. Athlete’s foot: Caused by dermatophyte fungi (tinea pedis), so this is a fungal infection rather than a bacterial one.
B. Gonorrhea: Caused by the bacterium Neisseria gonorrhoeae, so this example is bacterial.
C. HIV: Caused by the human immunodeficiency virus, making it a viral infection.
D. Tapeworm: A parasitic infection caused by a helminth (cestode), not a bacterium.
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