Which atoms,or groups attached to them,face into the minor groove of B-DNA?
A)purine 1 & 2;pyrimidine 2 & 3
B)purine 2 & 3;pyrimidine 2
C)purine 8 & 9;pyrimidine 1 & 6
D)purine 6 & 7;pyrimidine 4 & 5
E)purine 6 & 7;pyrimidine 2

Question

Which atoms,or groups attached to them,face into the minor groove of B-DNA? 
A)purine 1 & 2;pyrimidine 2 & 3 
B)purine 2 & 3;pyrimidine 2 
C)purine 8 & 9;pyrimidine 1 & 6 
D)purine 6 & 7;pyrimidine 4 & 5 
E)purine 6 & 7;pyrimidine 2

Quizplus · Accepted Answer

The minor groove of B-DNA is narrow and deep. The atoms or groups attached to purine 2 and 3 and pyrimidine 2 face into the minor groove. This is due to the specific hydrogen bonding pattern between the bases in the DNA double helix. Purine 2 and pyrimidine 2 form a base pair, while purine 3 forms a base pair with pyrimidine 3 in the opposite strand. Therefore, the atoms or groups attached to these bases face into the minor groove.

Which Atoms,or Groups Attached to Them,face into the Minor Groove