Explain the role of oxygen in cellular respiration. Oxygen is the final electron acceptor in the body lecturing transport chain. Each oxygen atom accepts from cytochrome A and from the mitochondrial matrix. The result is a molecule of .

This reaction explains why the body requires oxygen. Without it, this stops and, like a traffic jam, stops all the other processes leading to it. As a result, the cell produces to little to sustain .

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.