MCQ
The fish-like giant reptile which existed $200$ mya was
- APteranodon
- ✓Ichthyosaur
- CTriceratops
- DTyrannosaurus
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Reason : If several spermatozoa hit the egg at same time, all can enter the egg.
$i.$ Glucose or galactose may bind with the repressor and inactivate it.
$ii.$ In the absence of lactose, the repressor binds with the operator region.
$iii.$ The z-gene codes for permease.
$iv.$ This was elucidated by Francois Jacob and Jacque Monod.