Genetic Code

Genetic Code is discovered by

• Marshall W. Nirenberg and Har Gobind Khorana
• Rosalind Franklin and Linus Pauling
• James Watson and Francis Crick
• Charles Darwin and Gregor Mendel

Codon consists of how many nucleotides

• 3
• 5
• 6
• 4

how many codons are there in genetic code

• 50
• 70
• 64
• 61

how many codons do not code for amino acids

• 5
• 10
• 3
• 1

What are the special codons?

• Stop codons (UAA, UAG) only
• Start codon (AUG) only
• Start codon (AUG) and termination codon (TAA)
• Start codon (AUG) and stop codons (UAA, UAG, UGA).

What is an ambiguous codon?

• A codon that specifies a single amino acid.
• A codon that only occurs in prokaryotes.
• A codon that can specify more than one amino acid.
• A codon that is not recognized by any tRNA.