Question

Which is not true about the genetic code?

विकल्प

• It is exactly the same in all organisms.

• It is composed of a triplet code of three bases per codon.

• It produces 64 different possibilities of base sequences.

• It contains start and stop codons as instructions.

Answer 1

It is exactly the same in all organisms.

Explanation:

While the genetic code is often described as “universal” because it is highly conserved across life forms from bacteria to humans, it is not exactly the same in every single case. There are rare exceptions where certain codons specify different amino acids in specific organisms or organelles, such as in mitochondrial DNA or some protozoans. The other statements are true: the code is a triplet code using three bases per codon, these triplets create 64 different possible combinations, and specific codons like AUG (start) and UAA, UAG, and UGA (stop) provide the necessary instructions for starting and ending protein synthesis.