MCQ
Which distinguishes a morula from a blastula
- APresence of more yolk
- BAbsence of yolk
- CPresence of a cavity
- ✓Absence of a cavity
The stage in which solid mass of blastomeres appears is said to be morula,
whereas blastula is hollow with a cavity known as blastocoel.
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$I.$ Identification of $DNA$ with desirable genes
$II.$ Gene transfer
$III.$ Maintenance of $DNA$ in host and gene cloning
$IV.$ Introduction of $DNA$ into host to from recombinant $DNA$
Which of the following represents the correct sequence of steps?