Reproductive Health — BIOLOGY STD 12 Science — Question

Statement $I:$Autoimmune disorder is a condition where body defense mechanism recognizes its own cells as foreign bodies.

Statement $II:$Rheumatoid arthritis is a condition where body does not attack self cells.

In the light of the above statements, choose the most appropriate answer from the options given below:

$i.$ In transcription, adenosine pairs with uracil.

$ii.$ Regulation of lac operon by repressor is referred to as positive regulation.

$iii.$ The human genome has approximately $50,000\; genes.$

$iv. $ Haemophilia is a sex-linked recessive disease.

$1.$ primary treatment of sewage

$2.$ secondary treatment of sewage

$3.$ anaerobic sludge digester

$4.$ production of bioactive molecules