This is a model of translation in which the genetic code carried on mRNA is used to assemble amino acids into a polypeptide. A codon is a sequence of three nucleotides that codes for a particular amino acid. Using the model, where would you find a codon?

A codon can be found on the mRNA.

Explanation: Even though the model is not shown, translation is a process in which the genetic message in an mRNA molecule is converted into an amino acid sequence of a protein. A codon is a three nucleotide sequence on a mRNA that specifies a particular amino acid. During translation, the mRNA is passed through the ribosome three nucleotides at a time where with the help of a transfer RNA, the corresponding amino acid residue is fetched from the cytosol and attached to the growing polypeptide chain.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.