All living organisms - past, present and future are linked to each other. All organisms have arisen from a single distant ancestor. The strongest evidence for this will be:
1. All organisms have a triplet genetic code
2. DNA is the genetic material of almost all living organisms
3. The genetic code is degenerate but non-ambiguous
4. The amino acids specified by particular triplets are almost always identical between any two organisms.
Subtopic:  Genetic Code |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.

There is only a single mRNA codon for tryptophan, that is
1. UAC 2. UGG
3. UUU 4. UAG
Subtopic:  Genetic Code |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.