MCQ
$\text{DNA}$ strands:
- AHave quaternary structure like protein
- BAre bonded by disulphide bonds
- CHave same polarity
- ✓Are antiparallel
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$I.$ Haemophilia is a sex-linked recessive disease
$II.$ Down's syndrome is due to aneuploidy
$III.$ Phenylketonuria is an autosomal dominant gene disorder
$IV.$ Phenylketonuria is an autosomal recessive gene disorder
$V.$ Sickle cell anaemia is an $X$-linked recessive gene disorder