RNA and Codons

A codon is made of:

• 2 nucleotides

• 3 nucleotides

• 4 nucleotides

• 1 nucleotide

Which of the following codons is the start codon?

• UAG

• UAA

• UGA

• AUG

Which RNA type has an enzymatic activity?

• mRNA

• tRNA

• rRNA

• nRNA

An anticodon is:

• Attachment site in tRNA that binds to an amino acid

• A quadriplet of nucleotides that base pair with mRNA codon

• Attachment site in rRNA that binds to an amino acid

• A triplet of nucleotides that base pair with mRNA codon

The following codons " ACU, ACC, ACA, and ACG" code for which amino acid?

• Threonine

• Proline

• Leucine

• Serine

"All tRNAs carry the same amino acids"

• true

• false

What kind of bonding link the different amino acids together?

• covalent bond

• ionic bond

• peptide bond

• hydrogen bond