Question

The genetic code that directs protein synthesis in humans is found in

• A. No other kind of organism
• B. Virtually all organisms
• C. All animals; but not plants
• D. All multicellular not unicellular organisms

Answer 1

Answer: (B)

Virtually all organisms

A set of three nucleotides makes a codon which in turn codes for a specific amino acid. Genetic code is nearly universal, minor deviations in mitochondria and a few single-celled organisms, which means that a particular codon specify a particular amino acid in all the organisms. The mRNA codon "ACU" codes for threonine, irrespective of its source. Correct answer is B.