MCQ
Meselson and Stahl carried out centrifugation in CsCl2 density gradient to separate:
- ADNA from RNA.
- BDNA from protein.
- CThe normal DNA from 15N-DNA.
- DDNA from tRNA.
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$A$. This disorder was first described by Langdon Down $(1866)$.
$B$. Such an individual has overall masculine development. However, the feminine developement is also expressed.
$C$. The affected individual is short statured.
$D$. Physical, psychomotor and mental development is retarded.
$E$. Such individuals are sterile.
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