What is the molecular structure of DNA? 

Five persons, A, B, C, D, E, are sitting around a circular table facing towards the

centre.

1. A is the neighbour of E and D.

In a certain code language,'TREE' is written as WWHJ, and 'LEAF' is written as OJDK. How will 'BARK' be written in that language? 

Select the set in which the numbers are related in the same way as are the numbers of the given set.

Which figure from the given options would replace the question mark (?) if the following figure series were to be continued?

Select the option that is related to the third number in the same way as the second number is related to the first number.

52 : 91 : : 72 : ?

Select a unique number for each letter in the following table according to which a meaningful word will be formed when the letters are arranged. 

Select the related number from the given alternatives.

97 : 16 :: 85 ?

In a certain code language,

'Space Thee Bliss' is written as 'is jk th',

'Bliss Youth Last' is written as 'th cu wn',

In the given letter-cluster pairs, the first letter-cluster is related to the second letter-cluster following a certain