The Genetic Code

Review Questions

The AUC and AUA codons in mRNA both specify isoleucine. What feature of the genetic code explains this?

  1. complementarity
  2. nonsense codons
  3. universality
  4. degeneracy

Hint:

D

How many nucleotides are in 12 mRNA codons?

  1. 12
  2. 24
  3. 36
  4. 48

Hint:

C

Which event contradicts the central dogma of molecular biology?

  1. Poly-A polymerase enzymes process mRNA in the nucleus.
  2. Endonuclease enzymes splice out and repair damaged DNA.
  3. Scientists use reverse transcriptase enzymes to make DNA from RNA.
  4. Codons specifying amino acids are degenerate and universal.

Hint:

C