What feature of the genetic code makes it possible for a single protein to be encoded by more than one mrna sequence? a. there is more than one stop codon. b. each codon can specify more than one amino acid. c. the start codon also encodes methionine. d. more than one codon can specify the same amino acid.

d, more than one codon specify the same amino acid

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.