This sequence represents a single mutation. mutation #1: 5' - | ggc | gcg | gta | tta | gcg | - 3' complete these sentences about this mutated dna sequence.

Original:      5' - | GGC | GTG | GTA | TTA | GCG | - 3'
Mutation#1: 5' - | GGC | GCG | GTA | TTA | GCG | - 3'

Answer choices: 
  - Transition
  - Transversion
  - Nonsense
  - Silent
  - Missense.
 
1- This mutant DNA sequence is the result of a  mutation. (Transition
  or Transversion)

The correct answer is transition mutation.
transverion mutation is when a prymidine base (T) was replaced by annother prymidine base (C).

2- The effect of this base substitution on the amino acid sequence results in a mutation. 

The correct answer is a missense mutation.
This mutation is of T to C leads to amino acid subsitution of Alanine (GCG) instead of Valine (GTG).