MCQ
The material for organic evolution is
- AEffect of hormones
- BNutritive value
- ✓Mutation
- DAsexual reproduction
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$I.$ Each actin (thin filament) is made up of $2 \mathrm{~F}$ (filamentous) actins
$II.$ $F-$actin is the polymer of G (globular) actin
$III.$ $2 \mathrm{~F}=$ actins are twisted into a helix
$IV.$ Two strands of tropomyosin (protein) lies in the grooves of $F-$actin
The correct option is