In the last step of the ETC, Oxygen is used as the final electron acceptor. Where did this oxygen come from?

If assuming tasting ptc as a simple gene trait,what other genotype would you select to put in this missing genotype box that could result in this phenotype

Which of the following cell structures is significantly different between gram- positive and gram-negative bacteria?

Which of these correctly describes the difference between processes that take place in prokaryotic and eukaryotic cells?