In the "pulse-chase" experiment, palade and colleagues studied the pathway taken by newly secreted proteins in pancreatic acinar cells by labeling them with radioactive amino acids, removing unused label, and determining their location within the cells at various time points. which sequence represents the correct order in which the proteins were identified?
a. secretory vesicles → golgi apparatus → rough er → nucleus
b. golgi apparatus → rough er → nucleus → secretory vesicles
c. rough er → golgi apparatus → secretory vesicles
d. rough er → secretory vesicles → golgi apparatus

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.