Final answer:
A mutation that changed the DNA sequence from 5'-TGC GAT CC-3' to 5'-TGC GAG CC-3' is a transition mutation, due to the substitution of one purine for another.
Step-by-step explanation:
The DNA sequence 5'-TGC GAT CC-3' mutated to 5'-TGC GAG CC-3' is an example of a transition mutation. This type of mutation occurs when a purine base is replaced with another purine or when a pyrimidine is replaced with another pyrimidine. In this case, adenine (A), which is a purine, has been replaced with guanine (G), another purine. Transition mutations are one of the two main types of substitutive point mutations; the other type is a transversion, where a purine is replaced by a pyrimidine or vice versa. The altered DNA sequence can impact the transcription and translation processes, potentially leading to changes in the resulting amino acid sequence of the protein.