MCQ
During $\text{DNA}$ replication, the strands separate by:
- A$\text{DNA}$ polymerase.
- BTopoisomerase.
- ✓Unwindase$/$ helicase.
- DGyrase.
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$I$. In the absence of adenosine deaminase enzyme, purine metabolism is disturbed and $T-$lymphocytes fails to function $II$. $ADA$ deficiency is caused by the deletion of the gene for $ADA$
$III$. In some cases, it can be cured by bone marrow transplantation and enzyme replacement therapy. But in both approaches, the patients are not completely cured
$IV$. For permanent cure, genes isolated from the bone marrow cells producing $ADA$ at early embryonic stages can be a possible cure
Which of the above statements are correct?
$II.$ It varies from $15-100$ copies per cell. Choose regarding the above statements.