Q. 18 Please answer correctly well explained and not from google internet. Cholesterol is often considered by many people to be bad for health. Yet most of our cells produce cholesterol. Explain why this molecule is essential for us. Add some exemples if it needs to.

BSC1010C Enzymes & Cellular Regulation Dr. Harris 4. Compare the rate of the pepsin-catalyzed reaction at pH = 1.5 with the rate of the lipase- catalyzed reaction at pH = 1.5. 5. Compare the rate of the pepsin-catalyzed reaction at pH = 8.0 with the rate of the lipase- catalyzed reaction at pH = 8.0. 6. Based on your understanding of protein structure, explain in detail the effect of exposing an enzyme to a pH outside its optimal range. Include a discussion of the effect on both the structure and function of the enzyme. 7. At what pH values is lipase likely to be denatured? Explain your answer.

I'm not sure on how to answer this question.

104. A 32-year-old man is brought to the emergency department by ambulance 30 minutes after he was found unresponsive by his wife. Paramedics say that his blood glucose concentration was 22 mg/dL by fingerstick at the scene. He became responsive following administration of an ampule of 50% dextrose. On arrival, he says that he has a 3-month history of episodes of sweating and feeling shaky. His symptoms resolve when he eats a candy bar. Physical examination shows no abnormalities. The tentative diagnosis of insulinoma is made. In addition to a decreased glucose concentration, which of the following sets of findings in this patient during a fasting-induced hypoglycemic episode is most likely to confirm the diagnosis? A) B) C) D) E) F) Serum C Peptide ↑ Insulin 1 ↓ Urine Ketones present absent present absent present absent