Which of the following is not a mechanism of enzyme regulation? Activation by proteolysis Multiple forms of enzymes Transfigural control
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- The inhibition that make permanent damage to an enzyme is called: O Noncompetitive O Competitive O Reversible IrreversiblePMSF is a protease inhibitor that binds to enzyme active site. What is the possible mode of inhibition? Competitive O Irreversible O Non-competitive O MixedWhich of the following statements are true about enzyme regulation via noncovalent interactions? Select all that apply. Molecules can cause a change in enzyme shape because they're able to bind to the enzyme somewhere other than the active site The function of an enzyme is altered by a chemical change in its primary structure, which is called phosphorylation Molecules that are similar to the substrate in both size and shape can compete with the substrate for access to the enzyme's active site Molecules that are similar to the substrate in both size and shape can compete with the substrate for access to a location other than the active site
- hich of the following are advantages of quaternary structure? Choose all correct nswers 1) The genes may be for single subunits, rather than requirement for transcription and translation of giant sequences 2) Subunit construction may provide the structural basis for protein regulation 3) Multi-subunit proteins are more water soluble than single subunit proteins of the same size 4) Defects in protein synthesis may be fixed at the subunit level, rather than giant polypeptide level 5) May have multiple active sites - one on each subunitWhich of the following statements regarding enzymes and transition states is true? stabilization of the transition state must be less than stabilization of ES for catalysis to occur binding of substrate to an enzyme often causes strain, thus promoting transition state formation the transition state conformation of an enzyme catalyzed reaction is identical to the conformation seen in the uncatalyzed transition state formation of the transition state always assures that the reaction will proceed to product none of the above are trueWhich of the following is true of all allosteric enzymes? They have more than one active site on each subunit. They consist of proteins only. They have a nonprotein portion. Binding at one site affects the protein function at a second site. Which of the following explains why glycosides do not undergo mutarotation? There are no longer any stereocenters. There is no longer an anomeric carbon. The ring structure does not open to become the open-chain structure. None of the above is correct.
- Which of the following five processes are points of regulation for controlling enzyme-mediated reactions? Select 5 correct answer(s) Dihydrolipidation of arginine Disulfide bond acetylation Protein targeting RNA processing Cytosine methylation Proteolytic processing Protein degradationWhich of the following is the odd one out? Kinases Oxidoreductases Isomerases Lyases TranslocasesIn biochemistry, the activity of an enzyme is regulated by many factors as in the followings, except Allosteric modulators DNA melting points MRNA stability Dephosphorylation of phosphorylated proteins protein pH environment
- In the following example an enzyme is being inhibited. This is an example of Active site Inhibitor Altered active site O Non-competitive inhibition O Competitive inhibition MacBook AirBinding of a ligand to protein X affects the binding properties of another site on X. This is an example of which of the following phenomena? transition state stabilization competitive inhibition noncompetitive inhibition induced fit allosteric regulationWhich of the following is not a top category for enzymes according to the International Classification of Enzymes? Transferases Ligases Proteases Isomerases