Question

eurtansmitteenzyme found in the synaptic cleft and required for degrading a. glycosyltransferase c hemoglobin b. PDH complex e.catalase d. acetylcholinesterase 44. Which of the following is a tenet of the endosymbiotic theory? a autophagolysosomes are the source of substantial protein production viruses at some time i incorporated into the mitochondrial genome engulfed bacteria may be the original source of m more than one of the above pped in vesicles in the cytoplasm contribute to the cell's ATP supply e. the history of eukaryotic cells, phagocytosis of bactería resulted in bacterial genes being d. e. The key below to answer questions 45-48 As we have looked at the e regulatory methods for enzaymes, I have asked you to consider why each method met would be an efficient mechanism. goals listed below by matching up the atch the following regulatory methods to the scenarios or regulation method with a likely scenario in which it would be used. A. Substrate level regulation B. Allosteric activation E. Allosteric inhibition C. Positive cooperativity AB. Proteolytic cleavage D. Negative cooperativity esence of a particular molecule indicates the need for a pathway to be activated, i.e. the pathway is turned on ic enzyme/protein responds to small changes in substrate concentration by binding the substrate and increasing the affinity of binding/active sites on other subunits 47 Activity of an enzyme early in a long pathway is slowed by binding of accumulated downstre 48. Secreted enzymes nee d to be activated only after reaching a particular organ to prevent damage to other 49. A carboxyl group is shown at right. Think about how a carboxyl group undergoes ionization (what does it look like when it is charged). The action of Carboxypeptidase-A requires that carboxyl groups on two glutamates be present in the charged (ionized) form This information explains why carboxypeptidase-A.. a. most active in the intestine d. active over an exceptionally broad pH range b. most active in the stomach c. sensitive to Ca2 e. more than one of the above 50. Molecules that bind to an enzyme-substrate (ES) complex and prevent catalysis are categorized as_? a. competitive b. noncompetitive c.uncompetitive d. allosteric e. irreversible S1. Traber's presentation showed evidence that gene availability may be regulated by the unexpected binding/removal of which of the following? a. FAD b. CAMP c. ubiquitin d. cytochrome c e. ubiquinone 52. Which of the following is the initiol substrate entering the TCA cycle? c. NAD d. pyruvate e. histamine

Answer 1

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