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

In B-DNA, the minor groove is narrower and is formed by the edges of the base pairs that face each other. The atoms or groups attached to purine bases at positions 2 and 3 face into the minor groove, while the atom or group attached to the pyrimidine base at position 2 also faces into the minor groove. Therefore, option B is the best choice.

Which Atoms, or Groups Attached to Them, Face into the Minor