Final answer:
The correct answer is d) Animals, as transgenic animals can be genetically modified to express human proteins in their milk, useful for studying human diseases and for pharmaceutical production.
The correct otpion is d.
Step-by-step explanation:
Transgenic animals can be produced to study the development of human diseases or to yield abundant supplies of human proteins that can be secreted in their milk. The correct answer is d) Animals.
Transgenic animals have had their DNA modified to express recombinant DNA, which involves inserting genes from one species into the genome of another. Several human proteins, such as insulin and growth hormone, are produced in the milk of transgenic sheep and goats.
Furthermore, transgenic mice serve as models to study human diseases and the effects of gene mutations. This is because some proteins require a eukaryotic animal host for proper post-translational modifications and folding, processes that cannot always be completed adequately in bacteria or other non-animal systems.
The correct otpion is d.