Question

Choose the true statement(s) about nonstandard genetically encoded amino acids. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer. Choose the true statement(s) about nonstandard genetically encoded amino acids. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

a. Pyrrolysine is a nonstandard genetically encoded amino acid.

b. Stop codons encode nonstandard amino acids.

c. Selenocysteine is a nonstandard genetically encoded amino acid.

d. Nonstandard genetically encoded amino acids are only in bacteria.

Answer 1

A is correct answer because these are nonstandard amino acid but found in bacteria only, not in eukaryotic cell.

B is also correct statement because these are encoded by stop codons.

C is also correct statement.

D is wrong statement as selenocysteine is present in eukaryotes. So nonstandard amino acids are also present in eukaryotes.

So a, b and c are correct answer.