This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Transition mutation of GATCCT is 
Select and explain. 
A. GGTCCT, B. GTTCCT, C. GABCCT, D. GrUGGT
A: GGTCCT
Answer: A: GGTCCT 
Explanation: Point mutation is of 2 types:-


Transition Purine base is replaced by another purine base or pyrimidine base is replaced by another pyrimidine base.
Transversion Purine base is replaced by pyrimidine base or vice vessa.

In given question,
   GATCCT and GGTCCT  → only option A shows transition mutation