Which of the following correctly identifies the order of events that occur during the β-oxidation of saturated fatty acids?
1) Thiolytic cleavage by coenzyme A,
2) Dehydrogenation of α and β carbons by FAD-linked acyl-CoA dehydrogenases,
3) Dehydrogenation of L-β-hydroxyacyl-CoA by NAD-linked β-hydroxyacyl-CoA dehydrogenase,
4) Addition of H2O to the double bond
A. 1, 2, 3, 4
B. 3, 4, 2, 1
C. 2, 4, 3, 1
D. 2, 1, 3, 4

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.