Purines have ____ ring(s), (each) containing _____ nitrogen(s), whereas pyrimidines have _____ ring(s), (each) containing _____ nitrogens.
A) 1; 1; 1; 1
B) 1; 2; 1; 2
C) 2; 1; 1; 2
D) 2; 2; 1; 1
E) 2; 2; 1; 2
Answer: E
Purines have ____ ring(s), (each) containing _____ nitrogen(s), whereas pyrimidines have _____ ring(s), (each) containing _____ nitrogens.
A) 1; 1; 1; 1
B) 1; 2; 1; 2
C) 2; 1; 1; 2
D) 2; 2; 1; 1
E) 2; 2; 1; 2
Answer: E