The domestic sewage in large cities :

Read the following four statements (A-D) :
(A) In transcription, adenosine pairs with uracil
(B) Regulation of lac operon by repressor is referred to as positive regulation
(C) The human genome has approximately 50,000 genes
(D) Haemophilia is a sex-linked recessive disease
How many of the above statements are right ?

In gobar gas, the maximum amount is that of :

The orbital angular momentum of a p-electron is given as