Answer:
The correct option is;
A, B, and C, only
Explanation:
The amino group is the functional group of the form CH-NH₂ consisting of single bonds formed between hydrogen atoms, aryl groups, alkyl groups or two or more of such groups combined together bonded with a nitrogen atom. An amine is an organic compound that has an amino group in its composition or structure 
Therefore, the amino group can be found in the molecules of A, B, and C only.  
 
        
             
        
        
        
C. The number of covalent bonds is equal to the number of unpaired valence electrons. For example, nitrogen and phosphorous both have 3 unpaired valence electrons thus forming 3 covalent bonds.
 
        
             
        
        
        
The temp. affects on how quickly these chemical muscles reaction can occur
        
             
        
        
        
Well there are 4 things in a dna molecule and that is adenine guanine thymine and cytosine well the DNA molecule keeps the cell moving in the right direction and also helps the cell reproduce and stay healthy