The function of nad+ is to select one: a. cause the release of energy to adjacent cells when energy is needed in aerobic conditions. b. hasten the release of energy when the cell has been deprived of oxygen. c. carry hydrogen atoms and electrons. d. block the release of energy to adjacent cells. e. convert the potential energy of the proton gradient into the chemical energy in atp.

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.