Genetic Code | Anatomy2Medicine
Genetic Code

Genetic Code

Genetic Codon features

 

  • Unambiguous

 

      • Each codon specifies only 1 amino acid.

 

  • Degenerate/ redundant

 

      • Most amino acids are coded by multiple codons.
      • Exceptions: methionine and tryptophan encoded by only 1 codon (AUG and UGG, respectively).

 

  • Commaless, nonoverlapping

 

      • Read from a fixed starting point as a continuous sequence of bases.
      • Exceptions: some viruses.

 

  • Universal

 

    • Genetic code is conserved throughout evolution.
    • Exception in humans: mitochondria.

Exam MCQ

Which one statement is true about the genetic code?

  1. The genetic code table lists tRNA sequences.
    B. Every protein starts with a Pro amino acid.
    C. Each amino acid is encoded by exactly one codon.
  2. Only three codons have no matching anticodons.
  3. The genetic code table lists anticodon sequences.

Ans D

Exam MCQ

Which of the following is not a property of gentic Code

A   Non overlapping

B  Almost Universal

C  Four Stop Codons

D  Redundant

Ans C