In the salvage of purines, hypoxanthine-guanine phosphoribosyltransferase (HGPRT)is responsible for which of the following processes?Conversion of hypoxanthine to xanthineConversion of adenine to adenosine monophosphate (AMP)Conversion of guanine to guanosine monophosphate (GMP)Conversion of inosine monophosphate to inosine

Purines are heterocyclic rings made up of a five-membered ring fused to a six-membered ring.…

Answered: In the salvage of purines,…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Which of the following statements are descriptions of metal ion catalysis or examples of metal ion catalysis? Choose all correct answers a Zn²+ cofactor may properly orient the substrate in the active site through ionic interactions. a covalent bond forms between enzyme and substrate lowers the energy or stabilizes the transition state or intermediate catalyst retains its original form after reaction occurs catalysts may participate in oxidation-reduction reactions by changes in the oxidation state
Consider 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 1
S-adenosylmethionine is an activated carrier molecule that transfers which of the following groups? the carboxylic acid group (with one carbon) the phosphate group (with zero carbons) the glucose group (with six carbons) the methyl group (with one carbon) the acetyl group (with two carbons)
ATP synthase is a protein that catalyzes the formation of the energy storage molecule adenosine triphosphate using adenosine diphosphate and inorganic phosphate. Which of the following are true for the protein, ATP synthase? Select all apply A mutation of Asp61 to glutamic acid would have less of a deleterious effect on its ability to synthesize ATP than a mutation of Asp61 to alanine A mutation of Asp61 to alanine would have less of a deleterious effect on its ability to synthesize ATP than a mutation of Asp61 to glutamic acid The F1 subunit is primarily responsible for translocating H+ ions across the inner mitochondrial membrane during ATP synthesis The FO subunit is primarily responsible for translocating H+ ions across the inner mitochondrial membrane during ATP synthesis
The seed of the castor bean (Ricinus communis) contains large amounts of ricin, a deadly poison for animals, including humans. One of the two subunits of this toxin is a lectin that binds terminal N-acetylgalactosamine residues on glycoproteins on the surface of eukaryotic cells, allowing the other subunit to enter the cell and kill it by preventing proteins from being made. Select the possible antidotes that could prevent or reverse ricin-mediated entry of the toxin. a high concentration of N-acetylgalactosamine an oligosaccharide with the same structure as that recognized by ricin a compound that prevents synthesis of extracellular glycoproteins a compound that activates enzymes that break down glycogen into glucose an enzyme that degrades lipopolysaccharides
Amoeboid cells that migrate through our tissues, such as the class of white blood cells known as neutrophils, often do so in a directed manner, triggered, for instance, by chemical signals released by pathogens such as bacteria. Directed migration in response to a chemical stimulus is known as chemotaxis. Part of an efficient chemotactic response is the ability of cells to polarize. As is the case with our structurally-polar polymers like F-actin or microtubules, polarization here refers to an asymmetry in the cells, rather than an electrical charge. In this case, it involves one part of the cell becoming the “front” (or leading edge) and another the rear. In a well-polarized, migrating cell, it’s been observed that an active form of Rac (which, in turn, can activate ARP 2/3) is concentrated towards the front of the cell, whereas an active form of Rho (which, in turn, can activate formin, inhibit ADP, and activate myosin II) is found toward the rear of the cell. Based on your…
In the following scenarios, glucose is absent. Judging these systems as a whole, decide if B-galactosidase and permease are constitutive (always), unable (never), or inducible for each situation. Note, you must use the words inducible, unable, or constitutive. You should only have one answer per block. Please format your answer as a table and upload as a pdf or doc file B-galactosidase Permease |A) I POZYA I PΟΖΥΤΑ" B-galactosidase Permease B) IS ΡΟΖΥΤΑ I POCZYA B-galactosidase Permease С) I POZ'YA ΓΡΟΖΥΑ B-galactosidase Permease D) I PO̟ZYA ΡΟΖΥΤΑ B-galactosidase Permease E) I PΟΖΥΑ I POZ'YA
In which two ways does the ribulose monophosphate pathwaysave energy over reactions of the serine pathway?
Cut the following protein with the Serine Proteolytic enzyme Trypsin. How many peptide fragments are present after the protein is treated with Trypsin? Ala-Leu-Arg-Gly-Met-Val-Arg-Lys-Ala O 2 6. 8.
Which statement is true for the active site residues of RNase A, lysozyme, or trypsin? Select any/all answers that apply. O A. His12 (RNase A) initially acts as an acid. O B. His119 (RNase A) initially acts as an acid. O C. Glu35 (lysozyme) initially acts as an acid. O D. His57 (trypsin) initially acts as an acid. O E. Ser195 (trypsin) initially acts as an acid.
Phosphoribosyltransferase (PRT) catalyzes the attachment of a salvaged purine nitrogenous base on the activated form of ribose-5-phosphate called 5-phosphoribosyl- α α-pyrophosphate ( α α-PRPP). True Or False
A mutation has occurred that results in phosphofructokinase not being able to bind ATP in its allosteric site. What impact will this mutation have on the production of ATP in the cell? Select one: a. If no ATP can bind to the allosteric site, then phosphofructokinase will not be able to add the phosphate to fructose-6-phosphate to make fructose-1,6-bisphosphate and glycolysis will not work. So no pyruvate, not cellular respiration. b. If ATP cannot bind to the allosteric site, phosphofructokinase will not be activated to make more ATP by substrate-level phosphorylation. c. No impact on the production but will not be able to effectively shut off over production of ATP with feedback inhibition.

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