Choose the odd one out from the following terms and name the category to which the others belong:
Urochrome, Urea, Uric acid, Nucleic acid
Topic: Constituents of urine
Answer
Odd one out: NUCLEIC ACID. Category of the others: CONSTITUENTS OF URINE.
Urochrome, urea and uric acid are all found in URINE: UROCHROME is the yellow pigment that gives urine its colour, formed from the breakdown of haemoglobin. UREA is the chief nitrogenous waste in humans, made in the liver from excess amino acids. URIC ACID is another nitrogenous waste, formed from the breakdown of nucleotides.
NUCLEIC ACID is not an excretory product at all — it is a biomolecule (DNA and RNA) that carries genetic information inside the cell.
THE TRAP is the prefix. Three of the four words begin with UR-, and it is tempting to look for the odd one among them on some finer distinction — for instance that urochrome is a pigment while urea and uric acid are wastes. But the question asks for ONE odd term, and the category that holds three of them is "constituents of urine", which urochrome satisfies perfectly well. Nucleic acid is the only term that is not in urine at all.