64 An investigator is studying the mechanism of action of an insulin-sensitizing drug. The addition of the drug to cultured mouse hepatocytes is observed, and results show increased phosphorylation and inhibition of acetyl-CoA carboxylase Which of the following processes is most likely inhibited by this action of the drug? A) Fatty acid oxidation B) Fatty acid synthesis C) Glycogen synthesis D) Glycolysis E) Protein synthesis
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- It is noticed that when a strain of mice exercises, their blood glucose drops to very low levels. Which of the following can explain this situation? a) These mice do not make enough insulin b) these mice lack insulin receptors on their cells c)these mice lack glucagon d) these mice cannot synthesize glycogen from glucoseAnswer each of the following questions in about one sentence:(a) What is the biochemical basis for the action of Viagra?(b) What is the biochemical basis for the action of Prozac?(c) Oral administration of S-adenosylmethionine has been reported to beeffective in treating depression. Suggest a possible explanation.Von Gierke’s disease is a rare genetic disorder that results in a deficiency of glucose-6-phosphatase. Symptoms ketoacidosis, a buildup of glycogen in the liver, and lactate buildup. Why does this glycogen storage disease not affect the brain? a) The brain is able to still perform glycolysis effectively b) None of the above c) In the event of hypoglycemia, the brain is able to utilize other sources of energy to produce ATP d) The brain is able to metabolize lactate, which is present in high concetrations.
- Write a one-sentence explanation for each of the following statements. (a) In liver, glucagon stimulates glycogen breakdown via cyclic AMP. Although one might expect glucagon also to stimulate catabolism of the glucose formed, glucagon inhibits glycolysis and stimulates glu- coneogenesis in liver. (b) An individual with a glucose-6-phosphatase deficiency suffers from chronic hypoglycemia. (c) The action of phosphorylase kinase simultaneously activates glycogen breakdown and inhibits glycogen synthesis. (d) The presence in liver of glucose-6-phosphatase is essential to the function of the liver in synthesizing glucose for use by other tissues.Write a one-sentence explanation for each of the following statements.(a) In liver, glucagon stimulates glycogen breakdown via cAMP. Although you might expect glucagon to stimulate catabolism of the glucose formed as well, glucagon inhibits glycolysis and stimulates gluconeogenesis in liver.(b) An individual with a glucose-6-phosphatase deficiency suffers fromchronic hypoglycemia.(c) The action of phosphorylase kinase simultaneously activates glycogenbreakdown and inhibits glycogen synthesis.(d) The presence in liver of glucose-6-phosphatase is essential to the function of the liver in synthesizing glucose for use by other tissues.Which of the following is the primary process by which insulin stimulates glucose transport into adipose tissue cells?A) Activating Na+-K+ ATPaseB) Increasing synthesis of the glucose transporterC) Phosphorylating glucose to maintain the gradient of free glucose across the cellD) Promoting movement of the glucose transporter from the cytoplasm to the cell membrane
- How can bacteria producehuman insulin on an industrialscale? What are the otherforms of insulin madeavailable by thepharmaceutical industry?What is the raw material used for human insulin produced using E.coli? What is the stoichiometric equation of insulin production?During the fed state, which of the following occur(s)? a) insulin stimulation of malonyl CoA formation b) allosteric inhibition of carnitine acyltransferase I c) both a and b d) neither a nor b
- Novolog differs from "normal" insulin in that: Select one: a. An aspartic acid has been substituted for proline at B28 b. The proline at B28 and the lysine at B29 have been reversed c. A glycine has been substituten in at A21, and two new arginines have been added as B31 and B32 d. A "C-peptide" chain has been added e. The usual insulin molecule has been combined with zinc isophaneWhat peptides are expected to be produced when the A chain of bovine insulin (Figure 5.16) is cleaved by (a) chymotrypsin, or (b) trypsin, or (c) carboxypeptidase A?Vitamin K questionsa) What transformation of glutamate side chains is Vitamin K (as its reduced form, VitaminKH2) involved in, and what is the relevance of this reaction to blood clotting?b) How does the blood thinner Coumadin (warfarin) prevent clotting?c) How can the dietary intake of large amounts of green vegetables, such as broccoli or kaleinterfere with the action of Coumadin?