- AOnce
- ✓Twice
- CThrice
- DFour times
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$a -$ cell cycle can vary from organisation to organism and also from cell type to cell type.
$b -$ $DNA$ synthesis occurs only in pachytene.
$c-G_1$ phase corresponds to the interval between mitosis and initiation of $DNA $ reproduction.
$A$. Muscle bundles are held together by collagenous connective tissue layer called fascicle.
$B$. Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions.
$C$. Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins.
$D$. $M$ line is considered as functional unit of contraction called sarcomere.
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