MCQ
Membranous extensions in blue green algae are known as
- Aphytochrome
- ✓chromatophore
- Cmesosome
- Dpneumatophore
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Choose the correct option for $A, B, C, D$ and $E$

$i.$ 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.
Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.
