Question 37 A major difference between purine and pyrimidine biosynthesis is that pyrimidine: O are attached to the ribose sugar while being synthesized O are completely synthesized prior to attaching to the ribose sugar O are partially synthesized, the sugar is added, then synthesis is completed do not have a sugar moiety

Question 37 A major difference between purine and pyrimidine biosynthesis is that pyrimidine: O are attached to the ribose sugar while being synthesized O are completely synthesized prior to attaching to the ribose sugar O are partially synthesized, the sugar is added, then synthesis is completed do not have a sugar moiety

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter6: Energy, Enzymes, And Biological Reactions

Section: Chapter Questions

Problem 7TYK: In an enzymatic reaction: a. the enzyme leaves the reaction chemically unchanged. b. if the enzyme...

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In an enzymatic reaction: a. the enzyme leaves the reaction chemically unchanged. b. if the enzyme molecules approach maximal rate, and the substrate is continually increased, the rate of the reaction does not reach saturation. c. in the stomach, enzymes would have an optimal activity at a neutral pH. d. increasing temperature above the optimal value slows the reaction rate. e. the least important level of organization for an enzyme is its tertiary structure.
Which of the following statements about the allosteric site is true? a. The allosteric site is a second active site on a substrate in a metabolic pathway. b. The allosteric site on an enzyme can allow the product of a metabolic pathway to inhibit that enzyme and stop the pathway. c. When the allosteric site of an enzyme is occupied, the reaction is irreversible and the enzyme cannot react again. d. An allosteric activator prevents binding at the active site. e. An enzyme that possesses allosteric sites does not possess an active site.
Why Do Anabolic and Catabolic Pathways Differ? Why is the pathway for the biosynthesis of a biomolecule at least partially different from the pathway for its catabolism? Why is the pathway for the biosynthesis of a biomolecule inherently more complex than the pathway for its degradation?
complete the following mechanism showing the cleavge of the peptide bond for the following cysteine protease reaction. you only need a catalytic dyad for cystein proteases because the pKa of cysteine is low enough (8) and close enough to the pH of 7.4 that is can easily be deprotonated by histidine.
Chart is Given for you: Below is a chart of values for actual enzymes. Enzyme Km (M) kcat (1/s)Chymotrypsin 1.5 × 10^−2 0.14Pepsin 3.0 × 10^−4 0.5Tyrosyl-tRNA synthetase 9.0 × 10^−4 7.6Ribonuclease 7.9 × 10^−3 7.9 × 10^2Carbonic anhydrase 2.6 × 10^−2 4.0 × 10^5Fumarase 5.0 × 10^−6 8.0 × 10^2 Assume the enzyme concentration is equal across all samples (and is equal to 1). (Answer a and b only)a. Which enzyme will have the highest V0 at very high substrate concentrations? (1 M). Why? b. Which will have the highest V0 at very low substrate concentrations (5.0 × 10^−12). Why?
The key regulatory enzyme in pyrimidine synthesis is: a. Aspartate transcarbamoylase. b. Glutamine phosphoribosyl amidotransferase. c. Uridine monophosphate synthetase. d. Orotidylate decarboxylase
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Based on this graph, it appears that carboxylesterase is most active at a pH of A. 3.5B. 1.5C. 5D. 4
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The molecular structure of vitamin A is conjugated with N = 10. Calculatethe wavelength of light in the first transition of vitamin A.
#1 Specify the role each of the following amino acids play within the crystal structure and/or active site for Be as specific as possible, with pictures (and mechanistic arrows) as necessary. His11 Arg140 Glu89 Trp68 #2 Provide a step-wise mechanism for the reaction Bisphosphoglycerate mutase catalyzes, using the amino acids responsible for aiding in catalysis. You do not need to add surrounding amino acids that aid in substrate specificity. (drawn out)
70) The term Autotroph in bacteria refers to _____ source for an organism: a) Carbon b) Energy c) Electron d) Food e) Macromolecule71) A Chemolithotrophic organism gets its energy from: a) Chemical bond present in organic substance b) Chemical bond present in inorganic substance c) Chemical bond present in light d) a and c are correct e) none of the above72) Precursor metabolites are used in the biosynthetic pathways to: a) build elements b) assemble macromolecules c) assemble polymers d) monomers e) reduce sugar