Tyrosinase is an enzyme that catalyses the conversion of the amino acid tyrosine into the black pigment melanin. It is responsible for the black fur colour of some rabbits.
A group of rabbits kept at ${30^ \circ }C$ resulted in ${90^ \circ }C$ of the rabbits with light fur colour. A second
group of rabbits kept at ${10^ \circ }C$ resulted in ${90^ \circ }C$ of the rabbits with black fur colour.
Which hypothesis is supported by these results?
An inhibitor is present in rabbit skin cells that can bind strongly to tyrosinase when the external temperature is ${30^ \circ }C$.
2 )
At ${10^ \circ }C$ external temperature there are fewer tyrosinase-yrosine complexes formed and less melanin is produced.
3 )
Tyrosinase is an enzyme that is coded for by a gene that is switched off when the external temperature is ${10^ \circ }C$.
4 )
Tyrosinase is a temperature-sensitive molecule that is only activated when the external temperature is ${30^ \circ }C$.
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