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Question

First transgenic mouse grew twice the normal size after drinking -------- containing water.

A
Cu
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B
Fe
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C
Zn
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D
Ra
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Solution

The correct option is C Zn
When the transgenic mice were a few weeks old, they were given drinking water containing zinc. Mice carrying the transgene grew to twice the size of their litter mates because the metallothionein enhancer sequence stimulated by zinc had increased growth hormone production.

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