Which of the following pair of amino acids is specified by a single codon?

UUU (phenylalanine) and CGU (arginine)

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GUG (valine) and GCU (alanine)

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UGG (tryptophan) and AUG (methionine)

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UAC (tyrosine) and UGG (tryptophan)

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Solution

The correct option is C UGG (tryptophan) and AUG (methionine)
The genetic code is degenerate because there are many instances in which different codons specify the same amino acid.
Only tryptophan and methionine are encoded by just one triplet each. Tryptophan is coded by UGG and methionine is coded only by AUG.

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Q. What is common among the following amino acids: Phenylalanine, leucine, methionine and valine?

Q. Among the

α

-amino acids - threonine, tyrosine, methionine, arginine and tryptophan, those which contain an aromatic group in their side chain are:

Q. Select the aromatic amino acids : (a) Tyrosine (b) Valine (c) Lysine (d) Tryptophan (e) Serine.

The amino acid constituent of a protein is given: Methionine, Valine, Tyrosine, Arginine, Threonine, Stop codon. Choose the correct DNA sequence from below which codes for it.

Q. Match the following.

	Codons	Amino acids
A	UUU	I Serine
B	GGG	II Methionine
C	UCU	III Phenylalanin
D	CCC	IV Glycine
E	AUG	V Proline

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