Step 1: Know the purine and pyrimidine bases.
- Purines: Adenine (A), Guanine (G)
- Pyrimidines: Cytosine (C), Thymine (T), Uracil (U — found in RNA, not DNA)
Step 2: Eliminate incorrect options.
- Option (1): Uracil is not a component of DNA (RNA only)
- Option (2): Guanine is a purine, Cytosine is a pyrimidine, but order is reversed
- Option (3): Uracil is not present in DNA
- Option (4): Adenine (purine) and Cytosine (pyrimidine) is the correct pair in correct order.
The logic gate equivalent to the combination of logic gates shown in the figure is