Which of the following inhibits the activity of ac - iren
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Which of the following inhibits the activity of ac - iren
|
12-07-2007, 12:05 PM
Which of the following inhibits the activity of acetyl-CoA carboxylase?
A. Citrate B. Glucagon C. High-carbohydrate, low-fat diet D. Insulin
12-07-2007, 12:05 PM
20-year-old man always waits for rush hour to go home after work, even though he occasionally finishes his job much earlier. He usually squeezes onto a crowded train and presses his body against a woman. At these times, he usually has erections and sometimes ejaculates. This behavior is most characteristic of which of the following disorders?
A. Dyspareunia B. Exhibitionism C. Fetishism D. Frotteurism E. Sexual masochism
12-07-2007, 12:22 PM
b. because the activities of the enzyme is inhibited if phosphorylated ; which occurs when GLUCAGON or EPI bind to the recpectors or the energy status of the cell is low.
d.
12-07-2007, 04:17 PM
the answer to 1 question;
The correct answer is B. The key thing to remember here is that acetyl-CoA carboxylase catalyzes the first and rate-limiting step of fatty acid synthesis. If you got that far, you could have figured out which of the choices would inhibit the synthesis of fatty acids. Certainly glucagon, a catabolic hormone released in response to low blood glucose, would be a likely candidate to inhibit the synthesis of fatty acids. In fact, glucagon inhibits fatty acid synthesis by a cAMP-dependent phosphorylation of acetyl-CoA carboxylase. Conversely, glucagon stimulates fatty acid oxidation. Citrate (choice A) is a key player in fatty acid synthesis (citrate shuttle). Therefore, the presence of citrate would stimulate, not inhibit, acetyl-CoA carboxylase. A high-carbohydrate, low-fat diet (choice C) would stimulate, not inhibit, the synthesis of fatty acids. In contrast to glucagon, insulin (choice D) is an anabolic hormone that promotes fatty acid synthesis and therefore would stimulate acetyl-CoA carboxylase. It does so by dephosphorylating the enzyme. ANSWER to 2 question: The correct answer is D. The disorder belongs to the paraphilias, which are characterized by deviant or bizarre sexual impulses or practices. Patients repeatedly engage in this behavior and are unable to control their impulses. In frotteurism, sexual arousal is achieved by rubbing the genitals against women, usually in crowded places where a potential victim cannot easily escape. The disorder is more common in nonassertive, passive men. Dyspareunia (choice A) belongs to the sexual pain disorders and is defined by persistent genital pain before, during, or after sexual intercourse. The criteria for this disorder exclude vaginismus. Exhibitionism (choice B) is a paraphilia defined by the need for public exposure of the genitals to evoke shock or fear in victims. Offenders are usually male. Fetishism (choice C) is a paraphilia defined by the need to use certain inanimate objects to accomplish sexual arousal. It is usually seen in men. The disorder is accompanied by guilt, which is typically addressed in individual psychotherapy. Sexual masochism (choice E) is a paraphilia in which sexual pleasure is derived from being humiliated or physically or mentally abused by the partner. |
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