Inosine, one of the common alternative bases found in RNA, is shown below. How would inosine form hydrogen bonds in a double helical section of RNA?
A) 1 H-bond donor group, 0 H-bond acceptor groups
B) 0 H-bond donor groups, 1 H-bond acceptor group
C) 1 H-bond donor group, 1 H-bond acceptor group
D) 2 H-bond donor groups, 1 H-bond acceptor group
E) 1 H-bond donor group, 2 H-bond acceptor groups

Question

Inosine, one of the common alternative bases found in RNA, is shown below. How would inosine form hydrogen bonds in a double helical section of RNA? 
A) 1 H-bond donor group, 0 H-bond acceptor groups 
B) 0 H-bond donor groups, 1 H-bond acceptor group 
C) 1 H-bond donor group, 1 H-bond acceptor group 
D) 2 H-bond donor groups, 1 H-bond acceptor group 
E) 1 H-bond donor group, 2 H-bond acceptor groups

Quizplus · Accepted Answer

Inosine has one hydrogen bond donor group (the NH group) and one hydrogen bond acceptor group (the nitrogenous base). Therefore, it can form one hydrogen bond in a double helical section of RNA.

Inosine, One of the Common Alternative Bases Found in RNA