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                              Q:
                           
                           
                                                      | A) AT | B) TC | 
| C) AC | D) TG | 
                              Answer:   A) AT 
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
The nucleotides that are present in DNA molecule are 4. They are Thymine (T), Guanine (G), Adenine (A) and Cytosine (C).
Here in this Adenine pairs with Thymine (A - T) and Cytosine pairs with Guanine (C - G).
 
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