Which of the following is considered the 21st amino acid because it can bond to tRNA^sec during protein synthesis? A) citrulline B) ornithine C) selenocysteine D) xanadine

Question

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Selenocysteine is considered the 21st amino acid because it can be incorporated into proteins by a unique mechanism involving the tRNASec (tRNA^sec). This amino acid is rare and only appears in a small fraction of proteins found in living organisms.

Which of the Following Is Considered the 21st Amino Acid