Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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The meat tenderizer used in cooking is primarily papain, a protease enzyme isolated from the fruit of the papaya tree. Why do you suppose papain is so effective at tenderizing meat?
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- Please asnwer the following question: Suppose you specifically want to measure the amount of beta-glucose present in a sample. You have an enzyme that reacts specifically with the beta form of the sugar,and produces a signal that is easy to measure. However, every time you try to measure the amount of beta-glucose, mutarotation occurs and the alpha form of the sugar is converted into beta!! Can you suggest a simple way of overcoming this problem so you could measure only the beta form of the sugar? HINT: Is there a way you can prevent mutarotation?arrow_forwardEnzymes are stereochemically specific; that is, they oftenconvert only one stereoisomeric form of substrate intoproduct. Why is such specificity inherent in theirstructure?arrow_forwardWhy is lactose not fermented by yeast?arrow_forward
- In competitive inhibition A) a molecule competes for the allosteric site on an enzyme B) two proteins combine C) a molecule completes for the active site on an enzyme D) activation energy is reducedarrow_forwardConsider the metabolic pathway show below that converts substrate A to B with the enzyme A-ase, B to C with B-ase(I), and so forth. Acety/A-ase Acetate - A-ase Deacetylase A-ase Protease & C-ase B-ase ABCD What is the mechanism of regulation of B-ase? Positive allostery Reversible Covalent modification Isoenzymes Proteolytic Activation Feedback Inhibition 1arrow_forwardFluconazole is used to treat yeast infections by inhibiting the production of ergosterol. What would happen if you took away the ability for the yeast to produce ergosterol?arrow_forward
- Which enzyme is responsible for the cyclization of a glutamate derivative forming a proline precursor? A、AIR synthetase B、semialdehyde cyclase C、No enzyme is required D、IMP synthasearrow_forward1/v 1/[S] Compound I is a substrate for the enzyme reverse transcriptase and compounds Il and lll are inhibitors. The inhibition plots for each compound are Illustrated above. The line labeled E is the enzyme with substrate alone (no inhibitor present). Answer the following questions by filling în the blanks. Line A most likely belongs to compound because it is a inhibitor. Line B belongs to compound because it is a inhibitor.arrow_forwardThe activity of an enzyme can be regulated by a: A) competitive inhibitor binding to the active site. B) competitive inhibitor binding to the ES complex. C) noncompetitive inhibitor binding to the ES complex. D) Only A and C are correct. E) Only A and B are correct.arrow_forward
- Which step is catalyzed by the enzyme responsible for the Met 2 mutant? (picture attached) A) homoserine → cysteine B) cysteine → cystathionine C) cystathionine → homocysteine D) homocysteine → methionine E) methionine → homoserinearrow_forwardAeroderma pigmentosum patients have a 10,000-fold increase in the risk of developing Skin cancer. These patients have to avoid exposure to UV light. Please explain why. To answer the question please: I) name the process that is affected and provide a scheme; 2) indicate template, substrates, sources of energy that are involved in the process; 3) propose the consequences of the process.arrow_forwardProteases are one of the main drug targets. Choose the False statement regarding proteases. A. Proteases are enzymes that cleave peptide bonds. B. Water is a reactant in the reaction catalyzed by proteases. C. Proteases, like all enzymes show substrate specificity, meaning they cleave only substate that fit the bonding product. D. Proteases rely on the proton transfer from NADH to the substrate. E. Protease mechanism involves only acid-base catalysis.arrow_forward
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