Acyl transfer (nucleophilic substitution at carbonyl) reactions proceed in two stages via a "tetrahedral intermediate." Draw the tetrahedral intermediate as it is first formed in the following reaction. + H₂N OH • You do not have to consider stereochemistry. • Include all valence lone pairs in your answer. • Do not include counter-ions, e.g., Na+, 1, in your answer. • In cases where there is more than one answer, just draw one.

Select the best answer. .CI 1.) LIAIH(O'Bu)3 2) ( Ph-P-CH2 3 a) 1.) b.) 1.) c.) 1.) R 2) 2) H 2) e) 1.) d.) 1.) 2) O. 2)

Which control test tubes contained reducing sugars? Are these the results consistent with the sugars tested, explain? Sucrose and lactose are both disaccharides, explain why the test results are the same or different? Sucrose 8 minutes Blue color like Benedict's solution, not reaction.        -    Lactose 8 minutes orange-red color       + Glucose 8 minutes Orange-red color        +

A nickel-containing transmembrane protein ___________. Select one: a. contains a cofactor and is found in the cytosol b. contains a cofactor and is found in the cell membrane c. is a dimer and is found in the cytosol d. contains a cofactor and is a dimer e. is a dimer and is found in the cell membrane