The stomach is the correct answer it is lined with an digestive enzyme called pepsin.
The correct answer is A. Lac repressor.
Lac repressor prevents lac gene which are found in the DNA of Escherichia Coli from being expressed for many times.
Lac repressor is termed as DNA which binds proteins. It allows the expression of genes from coding which are made for proteins to be involved in metabolism of lactose which is in bacteria.
When there is no lactose which is available in the cell, then the genes are being repressed. Lactose are being converted to allolactose if they are available.
The person who is most likely to be interested in the research involving the transfer of energy by the organisms living in the ocean's hydrothermal vents is Everett Shock.
He along with his students tests and develops the thermodynamic data for the bio-molecules, minerals, and the aqueous solutes. The reactivity of the organic compounds is explored by them in the hydrothermal conditions. So, he is the most likely person to be interested in the said discovery.
Hence, the answer is 'Everett Shock'.