Haemorrhage frequently happens in viral dengue fever. Compare this condition with haemophilia.

Name the nitrogenous base with which Guanine pairs up in the helical structure of DNA and through how many hydrogen bonds?

When an irritant enters the nose, a sneezing reflex happens. Identify the stimulus and the response.

An atomic explosion in 1945 in Japan led to a large number of persisting deformities in the bodies of plants and animals. What might have happened?