Question

codons are found on ________.
dna
rrna
mrna
trna
question 5
which of the following is not a nitrogen base in rna?
uracil
adenine
guanine
thymine

Explanation:

• Codons: Codons are sequences of three nucleotides that correspond to specific amino acids during protein synthesis. They are found on mRNA (messenger RNA). DNA contains the genetic code, but during transcription, mRNA is synthesized from DNA. rRNA (ribosomal RNA) is part of the ribosome structure, and tRNA (transfer RNA) has anticodons that pair with mRNA codons.
• Nitrogen - bases in RNA: RNA contains uracil (U), adenine (A), guanine (G), and cytosine (C). Thymine (T) is a nitrogen - base found in DNA, not RNA.

Answer:

1. mRNA
2. Thymine