Answer :
Different cells use different transcription units. Different cells use different polyadenylation sequences. Different cells splice the same transcript differently. Different isoforms are produced. Different cell types make the same protein. The following statement is true.
Different cells use different transcription units, which are regions of DNA that are transcribed into RNA molecules. Different cells also use different polyadenylation sequences, which are the sequences of RNA that signal the addition of the poly(A) tail during mRNA processing. Additionally, different cells can splice the same transcript differently, resulting in different mRNA isoforms. These different mRNA isoforms can produce different protein isoforms, or meso forms, which have slightly different amino acid sequences and functions. Despite these differences, different cell types can still make the same protein, as long as they share the same coding sequence in the mRNA.
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