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Cyclic-AMP stimulates which of the following?
a) PKA
b) PKC
c) Ras
d) RTK
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- What is CPAM?Identify the following statements as true or false. If a statement is false, explain what is wrong with that statement a) Transition state analogs bind very tightly with the enzyme active site as they form covalent bonds with the active site b) Receptor desensitization happens upon prolonged exposure of receptors to both agonists and antagonists c) Dactinomycin and Doxorubicin are examples of drugs that bind with the major groove of DNA d) Mitomycin C forms interstrand crosslinking while cisplatin forms intrastrand crosslinking of DNA1) How many binding sites per molecule does the receptor have? 2) What type of cooperativity is observed with this binding protein? a) No cooperativety b) Positive homotropic cooperativity c) Positive heterotropic cooperativity d) Negative homotropic cooperativity e) Negative heterotropic cooperativity f) none of the above
- An increase in PCO2 will result in which of the following? O a) An increased affinity between PO, and Hb, shifting the oxyhaemoglobin dissociation curve to the right b) An increased affinity between PO, and Hb, shifting the oxyhaemoglobin dissociation curve to the left O c) A decreased affinity between PO, and Hb, shifting the oxyhaemoglobin dissociation curve to the right O d) A decreased affinity between PO, and Hb, shifting the oxyhaemoglobin dissociation curve to the leftWhich of the following statements is CORRECT? A) Hexokinase IV is allosterically inhibited by glucose-6-phosphate. B) AMP is an allosteric inhibitor of phosphofructokinase-1. C) ATP functions as a chemical inhibitor of pyruvate kinase within muscle. D) Pyruvate kinase is allosterically activated by fructose-1,6-bisphosphate. E) A and D F) C and DWhat is the likely function of the cytosolic cAMP in this transduction pathway? Question 16 options: a) It is a competitive inhibitor of the protein kinase. b) It is a hormone. c) It is a messenger RNA. d) It is a coenzyme. e) It is a second messenger.
- Q1 a) What is the difference between non-competitive or allosteric modes of inhibition for the compounds acting upon the caspases studied. b) How many caspase isozymes are known in humans? c) What is the reaction catalyzed by a caspase enzyme?What biochemical changes are required to convert tyrosine to (a) norepinephrine and (b) epinephrine?Which of the following is not a phospholipase?a) Ab) Cc) Dd) K
- How many products are obtained by the hydrolysis of phosphatidylinositol by phospholipase C?a) 1b) 2c) 3d) 4What is the biological function of the Neurofibromin-1 (NF1) protein?. Based on what you know about enzyme inhibition, classify the following examples as irreversible, competitive, or noncompetitive enzyme inhibition. A) competitive B) noncompetitive C) irreversible 1) Diisopropyl fluorophosphate binds to acetylcholinesterase and permanently inactivates the enzyme. Paralysis results. 2) A drug binds to the active site of an enzyme but disassociates and leaves the enzyme active. 3) A toxin binds to the surface of an enzyme. The enzyme then binds the substrate, but no product is produced. The toxin may disassociate and the enzyme will become active again. 4) Vitamin K is a coenzyme involved in blood clotting. An anticoagulant drug binds at the site of vitamin K bonding, blocking vitamin K binding and preventing clotting. Clotting resumes after the patient stops taking the drug. 5) Aspirin binds to prostaglandin synthetase and permanently stops its ability to produce prostaglandin.