The second messenger cAMP is degraded by phospholipase A 1. a protease. a phosph
ID: 71289 • Letter: T
Question
The second messenger cAMP is degraded by phospholipase A 1. a protease. a phosphatases. a phosphodiesterase. kinase. ATP is a cosubstrate of the enzyme phosphofructokinase-1 (PFK-1). Inmost species ATP is also an inhibitor of PFK-1 at higher concentrations. This seems to violate Le Chatelier's Principle. Which statement below would provide a suitable explanation? PFK-1 must be phosphorylated by ATP in the active site and the phosphorylated PFK-1 must be the less active form. There must be another cofactor interacting with ATP at high concentrations to achieve inhibition of PFK-1 ATP actually activates the reverse of the reaction preceding the PFK-1 step in the pathway. It likely has no direct effect on PFK-1. There are two sites on PFK-1 that bind ATP. One is the active site; the other is the regulatory site where inhibition occurs. Cholesterol is converted to cholesteryl esters for in cells that are (more, less) hydrophobic than glycerolphospholipids. transport and storage; more synthesis and transport; less synthesis and storage; more transport and storage; less synthesis and transport; more Glycogen synthesis in vertebrates requires to activate glucose 1- hosphate. ATP NADH UTP CoASH All of the above In yeast, which of the following is not among the possible fates of pyruvate after glycolysis? used in the biosynthesis of alanine further oxidation by the ctric acid cycle conversion to ethanol conversion to lactate conversion directly to oxaloacetate, to replenish this important intermediate in the citric acid cycle.Explanation / Answer
15. The second messenger cAMP is degraded by phosphodiesterase.
21. PFK-1 catalyse the formation of Fructose-1,6- bisphosphate. ATP is required for the formation of this, at the same time high level of ATP allosterically inhibits this reaction. So there are two sites on PFK-1 that bind ATP. One is active site and the other is regulatory site where inhibition occurs.
22. The cholesterol are converted to cholesteryl esters for transport and storage in the cells that are more hydrophobic than glycerophospholipids.
23. The glucose-1-phoshate is activated by the addition UDP group which requires UTP as the factor.
24. Under anaerobic conditions in yeast the pyruvate cannot participate in conversion to lactate as this happens only in human tissues.
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