926 what is the basic strategy by which proteins are

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What type of damage occurs if there is a defect in the urea cycle? 926What is the basic strategy by which proteins are degraded? 927Which amino acids can be converted to pyruvate by a single enzyme-catalyzed reaction? 928What general feature is involved in the degradation of aromatic amino acids? 929Biopterin is a complicated coenzyme required for the conversion of phenylalanine to tyrosine. Why is biopterin not considered a vitamin? 930What is the cause of PKU? Give the structure of the abnormal metabolite that accumulates from which this condition gets its name. 242
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Chapter 8 / Exercise 14
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Chapter 1 Biochemistry and the Unity of LifeChapter 31Amino Acid SynthesisMatching QuestionsUse the following to answer questions 1–10:Choose the correct answer from the list below. Not all of the answers will be used.a) atmospheric nitrogen (N2)b) 3-phosphoglyceratec) cumulatived) nitrogen fixatione) B12f) histidineg) tetrahydrofolateh) committedi) pyridoxal phosphatej) enzyme multiplicityk) MoFe cofactorl) ammonia (NH3) 1._______________ is the original nitrogen source for the nitrogen found in amino acids. 2.The process of converting N2to NH3is called _______________. 3._______________ is the site of nitrogen fixation by nitrogenase enzymes. 4.The precursor for serine, cysteine, and glycine amino acid biosynthesis is _______________. 5.A versatile carrier of one-carbon units is _______________. 6.Methylcobalamine is derived from vitamin _______________. 7._______________ is a cofactor for transamination reactions.243
Chapter 1 Biochemistry and the Unity of Life8.The final product pathway that inhibits an enzyme that catalyzes its production typically takes place at the _______________ step.9.Glutamine synthesis is inhibited by _______________ feedback inhibition. 10.Isozymes, or multiple enzymes with the same identical catalytic properties but with different regulation, are an example of _______________.Fill-in-the-Blank Questions11.Only a few prokaryotes, such as _____, are able convert N2to ammonia.12._____ ATP molecules are hydrolyzed for each N2reduced.13.The α-amino group found in most amino acids comes from _____ through a transamination reaction.14.Glutamine synthase adds NH3to _____ to make glutamine.15.Glutamate is the precursor for the amino acids glutamine, proline, and _____.16.Methyl, methylene, and _____ units can be carried by tetrahydrofolate. 17.Homocysteine is an intermediate in the synthesis of cysteine and _____.18.The enzyme _____ is regulated by cumulative feedback inhibition.19.The binding of serine to 3-phosphoglycerate dehydrogenase induces a _____ in Vmax.20.Metabolic pathways that have alternate products are often regulated by _____ and _____.244
Chapter 1 Biochemistry and the Unity of LifeMultiple-Choice Questions21.Amino acid synthesis is generally regulated byA)turnover. B)diet. C)feedback and allosteric enzyme regulation. D)A and B. E)A, B, and C. 22.Organisms capable of carrying out reduction of atmospheric nitrogen includeA)some bacteria and archaea. B)higher eukaryotic organisms, such as mammals. C)all plants.

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