A plot of the velocity \( v \), or rate, of an enzymatic reaction vs. the substrate concentration \([S]\) that is sigmoid or S-shaped instead of hyperbolic is characteristic of:a) allosteric enzymes b) modulator proteins c) isozymes d) proenzymes e) zymogens

Enzymes can be defined as catalysts for biochemical reactions. These are organic compounds that take…

Answered: A plot of the velocity v, or rate, of…

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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B) Read the situations below and indicate which of the four methods of enzyme regulation is occurring for each. a) The energy-carrying molecule ATP is made by the enzyme ATP synthase. Muscle cells use a lot of energy and also have higher amounts of the ATP synthase enzyme than many ouier cem types. General mechanism of enzyme regulation: /1 b) Prostaglandins are messenger molecules involved in the inflammatory response, as well as th perception of pain. They are synthesized from polyunsaturated fatty acid substrates by an enzyn called cyclo-oxygenase. "Ibuprofen" is the active ingredient in a variety of anti-inflammatory medications such as Motrin® and Advil®. It reduces pain and swelling by binding to a hydrophobic channel in the active site of cyclo-oxygenase, blocking the polyunsaturated fatty acids from binding to the enzyme, and therefore stopping production of prostaglandins. General mechanism of enzyme regulation: a) In point form, describe the steps by which ATP is produced…
Penicillin and related drugs inhibit the enzyme _____; this enzyme is produced by _____. A) β-lacamase; bacteria B) lysozyme; human cells C) aldolase; bacteria D) transpeptidase; bacteria E) transpeptidase; human cells
The value of Vmax for an enzyme-catalyzed reaction: A) most often reflects the chemical steps of catalysis B) can be determined from initial velocities that are linear with respect to substrate concentration OC) is limited only by the amount of substrate supplied D) can be converted to kcat/Km by accounting for the enzyme concentration OE) is higher for enzymes that also exhibit higher Km values
14) Which of the following statements is true under the conditions provided: the enzyme concentration is 0.5 nM, substrate concentration is 10 µM, and the KM = 20 µM? a) The enzymatic reaction occurs at maximal velocity. b) The enzymatic reaction occurs between half-maximal and maximal velocity. c) The enzymatic reaction occurs at around half-maximal velocity. d) The enzymatic reaction occurs at between zero and half-maximal velocity. e) Not enough information given to know about the enzymatic reaction rate.
4. The use of ATP to move substances across a plasma membrane of a cell occurs in a) facilitated diffusion b) simple diffusion c) osmosis d) active transport 5. Which of the following is NOT true concerning enzymes? a) they increase the rate at which a reaction proceeds b) enzymes are specific for their substrates c) enzyme names usually end with the suffix “-ase” d) since an enzyme is modified by a reaction, a given enzyme molecule can be used only once 6. DNA is replicated during what part of the cell cycle? a) S phase b) mitosis c) meiosis d) cytokinesis
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An intermediate of the citric acid cycle that undergoes reductive amination with glutamine as nitrogen donor is a-ketoglutarate a) b) Glutamine c) NADPH d) H+
What does an enzyme change relative to an uncatalyzed reaction? a) The rate of the reaction. b) The free energy change of the reaction. c) The size of the active site. d) The pH. e) The equilibrium constant.
there are A-D questions to this picture set up. A) What enzyme catalyzes this reaction? B) What is Delta G, please answer in Joules, K=19 C) If concentration of Glucose-1_Phosphate is 48.82 uM at equalibrium, what is the concentration of Glucose-6-phosphate in uM? D) If the reaction is NOT at equalibrium, what is delta G at 25C if the concentration of Glucose-1-phosphate is 15.04 uM and concentration of Glucose -6-phosphate is 1.62 mM? please answer in Joules and in significant figures. *note, 10^3uM in 1 mM Thank you!!
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 reduced
Which of the following describes a purpose for the function of phosphoglucoisomerase? a) allows for phosphorylation for trapping the molecule in the cell b)promotes substrate level phosphorylation and formation of ATP c) allows formation of a primary alcohol necessary for the next step of phosphorylation d)facilitates epimerization, the change in stereochemistry at one chiral carbon
There are many metabolic pathways in a biological system, and it is critical to regulate these pathways so that only particular pathways are active at a single time. Which enzyme would be in the regulation point in the hypothetical pathway shown below. A¹B 2C 3 D4E A) A → B B) B-C C) C-D D) D→ E E) The regulation point is highly dependent upon the metabolic pathway.

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A plot of the velocity v, or rate, of an concentration [S] that is sigmoid or Sened instead of hyperbolic is characteristic of: enzymatic reaction vs. the substrate a) b) c) allosteric enzymes modulator proteins isozymes proenzymes zymogens