Answer:Arg is replaced by His
Explanation:
When finding the complementary RNA your first bases would be AUG-CGU-ACC-UUA. For the mutated sequence it would be AUG-CAU-ACC-UUA. Now you use the corona chart and get that the original sequence would’ve been ARGININE and the mutated sequence is HISTIDINE. In case you need the RNA : Leucine-Arginine-Threonine-Leucine MUTATED: Leucine-Histidine-Threonine-Leucine