Codon
from class: Microbiology Definition A codon is a sequence of three nucleotides in mRNA that specifies a particular amino acid or a termination signal during protein synthesis. It is the basic unit of the genetic code.
congrats on reading the definition of codon . now let's actually learn it.
Predict what's on your test 5 Must Know Facts For Your Next Test There are 64 possible codons, with each one corresponding to a specific amino acid or stop signal. The start codon AUG codes for methionine and signals the beginning of translation. Stop codons (UAA, UAG, UGA) do not code for any amino acids and signal the end of translation. Codons are read in the 5' to 3' direction during translation by the ribosome. Codon usage can be biased in different organisms, influencing gene expression levels. Review Questions What role does the start codon play in protein synthesis? How many stop codons exist in the genetic code and what are they? Why is it important that codons are read in the correct frame?
© 2024 Fiveable Inc. All rights reserved. AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.