How many nucleotides make up one codon on mRNA?
Answer and explanation
Correct answer: D. 3
- Step 1: A codon is a sequence of three bases that codes for one amino acid.
Answer
3.
Why not the others: 1: one nucleotide is a single base unit; a codon is a triplet. 2: two bases can code for only 16 combinations, too few for 20 amino acids. 4: a codon is a triplet, not four bases.
Practise more DNA, RNA and protein synthesis.
Free questions with an explanation for every one, and full timed South Africa Matric mock tests.
More DNA, RNA and protein synthesis questions
- Which three components make up one nucleotide of DNA?
- In a DNA molecule, adenine pairs with
- A DNA template strand has the base sequence TAC GGA. What is the base sequence of the mRNA transcribed from it?
- In which part of a eukaryotic cell does transcription take place?
- Translation of mRNA into a polypeptide takes place at the
- What is the role of tRNA in protein synthesis?