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NEET 2019 · BiologyPrevious Year Question

Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology? (NEET 2019)

Answer: (C) Genetic code is nearly universal. Answer: (C) Genetic code is nearly universal Solution: Because the genetic code is (nearly) universal, the same codons specify the same amino acids in humans and in bacteria.

  1. A.Genetic code is not ambiguous
  2. B.Genetic code is redundant
  3. C.Genetic code is nearly universal✓
  4. D.Genetic code is specific

Correct Answer

(C) Genetic code is nearly universal

Solution & Explanation

Answer: (C) Genetic code is nearly universal Solution: Because the genetic code is (nearly) universal, the same codons specify the same amino acids in humans and in bacteria. A human gene therefore translates correctly when expressed in E. coli, allowing bacteria to synthesise authentic human insulin. Universality (shared codon dictionary across organisms), not redundancy/ambiguity/specificity, is what permits cross-species expression. NCERT Reference: Ch 10, p.182, line 010 — "In 1983, Eli Lilly an American company"

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