MCQ
The two strands of $DNA$ are held together by
- Apeptide bonds
- Bphosphodiester bonds
- ✓hydrogen bonds
- D$S- S$ bonds
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$I.$Ectoderm - Epidermis
$II$.Endoderm - Dermis
$III.$Mesoderm - Muscles
$IV.$Mesoderm - Notochord
$V.$Endoderm - Enamel of teeth