During the sequencing of the chimpanzee genomes, a gene (cmah) was identified that completely lost an exon in human when compared to chimpanzee. scientists have found no evidence of the protein or its enzyme function in any human tissue although the protein is fully functional in chimpanzee. the normal function of the gene is to add modified sialic residues to proteins on the cell membrane. the loss of the exon is found in all humans that have been examined, but the gene is conserved in all other primates and mammals

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical? a. some people consider embryos to possess rights equal to those of fully developed human beings. b. extracting stem cells from embryos is a very energy-intensive process, which consumes resources that could be used elsewhere. c. embryos are difficult to obtain, so the monetary cost of using them for research outweighs their benefit. d. the process of extracting stem cells from embryos generates biohazardous waste that cannot be safely disposed of.