GATE 2022 ES – Question 44
A plasmid-free bacterial cell has one chromosome and dry-mass composition55% protein,3% DNA,21% RNA. At least2500 protein types are expressed. Which molecular-count statements are NOT correct?
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Correct answer: (A) DNA=RNA=protein≥2500; (B) DNA=RNA=1;protein≥2500; (C) DNA=1;RNA=protein≥2500
Explanation
A chromosome is one DNA molecule in the idealized single-chromosome cell, excluding A. Many transcripts and ribosomal/transfer RNA molecules exclude B. There is no requirement for equal RNA and protein molecule counts, excluding C. The official selection is **A, B, C**, accepting D. Strictly, mass percentages and protein-type counts alone do not mathematically establish RNA>protein; that ordering relies on assumed typical molecular masses and abundances.