MCQ
QRST is related to:
- ✓Atrial contraction or depolarisation
- BAtrial relaxation
- CVentricular contraction
- DCardiac cycle
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$I.$ Occurs between $G_{1}$ and $G_{2}$
$II.$ $DNA$ replication begins in the nucleus
$III.$ Centrioles duplicate in the cytoplasm
$IV.$ As $DNA$ is doubled, number of chromosomes also doubles
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