单项选择题

The reason a nose is not likely to turn into a kidney is that______ .

A．cells in the nose do not contain instructions
B．a nose does not contain brain cells
C．instructions in a nose cell are inactivated
D．the stern cells have not been specialized

相关考题

When stem cells specialize, they ______ .A．grow into bo...

单项选择题When stem cells specialize, they ______ .

A．grow into body parts
B．are destroyed
C．are set back to a pristine state
D．turn nose into kidney

The phrase "biological carbon copies" (para. 4) refers ...

单项选择题The phrase "biological carbon copies" (para. 4) refers to______ .

A．physical characteristics of real market value
B．body tissues
C．cloned animals
D．stem cells