MCQ
Which is wrong about nucleic acids?
- ADNA is single stranded in some viruses.
- BRNA is double stranded occasionally.
- CLength of one helix is 45 Å in B-DNA.
- DOne turn of Z-DNA has 12 bases.
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$a.$ Memory
$b.$ Communication
$c.$ Blood pressure
$R$ : Kidneys help in removal of metabolic wastes along with regulating the osmolarity of body fluids.

$Y -$ Crossing over is the exchange of genetic material between two homologous chromosomes.