CAMPBELL BIO&VALPK A/C MAST PKG
9th Edition
ISBN: 9780134784434
Author: TAYLOR & SIMON
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 9TYK
Why is the barrier of the activation energy beneficial for cells? Explain how enzymes lower activation energy.
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Enzymes are able to reduce the activation energy barrier in a number of ways. List at least three ways
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There is an enzyme that catalyzes the production of the pigment responsible for dark fur color in Siamese cats and Himalayan rabbits. This enzyme is thermolabile, meaning that it does not function at higher temperatures. Rabbits raised at 5°C are all black. If raised at 20°C, they are white with black paws, ears, and noses; they are all white when raised at 35°C.
Draw an activity curve for this enzyme, and explain.
A group of young researchers was working on a biochemical pathway. At that time, they produced an enzyme having altered active site. Do you think, the activity of the new enzyme would differ from the original one? Why? On a different reaction they found, an enzyme works best at a temperature near about 30 degree Celsius. At 60 degree Celsius, the enzyme becomes inactivated. Briefly explain, why that enzyme is not working at elevated temperature?
Chapter 5 Solutions
CAMPBELL BIO&VALPK A/C MAST PKG
Ch. 5 - Fill in the following concept map to review the...Ch. 5 - Label the parts of the following diagram...Ch. 5 - Which best describes the structure of a cell...Ch. 5 - Prob. 4TYKCh. 5 - The sodium concentration in a cell is 10 times...Ch. 5 - The synthesis of ATP from ADP and a. stores energy...Ch. 5 - Facilitated diffusion across a membrane requires...Ch. 5 - What are the main types of cellular work? How does...Ch. 5 - Why is the barrier of the activation energy...Ch. 5 - Relate the laws of thermodynamics to living...
Ch. 5 - How do the components and structure of cell...Ch. 5 - Sometimes inhibitors can be harmful to a cell;...Ch. 5 - Cells lining kidney tubules function in the...Ch. 5 - SCIENTIFIC THINKING Mercury is known to inhibit...Ch. 5 - A biologist performed two series of experiments on...Ch. 5 - Organophosphates (organic compounds containing...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- In a metabolic pathway, succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, a substance that resembles succinate and can bind at the active site but cannot be acted upon by succinate dehydrogenase. Is Malonate a competitive or non -competitive inhibitor. What is the difference between the two types of inhibition? Can you overcome inhibition caused by Malonic acid?arrow_forwardEnzymes lower the activation energy, but where does the energy to lower the activation energy come from?arrow_forwardDescribe the effect of catalysis on activation energy.arrow_forward
- Why is the process of activation a useful strategy in metabolism?arrow_forwardB) 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…arrow_forwardThere are microorganisms that live in extreme environments like volcanic vents which temperature reaches to 80 degrees celsius. Considering enzymes experience denaturation at higher temperatures, how do the enzymes of these microorganisms remain active at such extreme condition?arrow_forward
- PTGS1 and PTGS2 are isozymes. Isozymes catalyze the same reaction, but are separate genes. What types of reactions to PTGS enzymes catalyze? Also, what pathway are these enzymes a part of?arrow_forwardA potent inhibitor effectively inhibits an enzyme catalyzed reaction. What kind of a Ki value you would expect for a potent inhibitor?arrow_forwardExplain the advantage of the enzymatic activity ?arrow_forward
- Please handraw this graph with all the necessary detailed information: Imagine that I text enzyme rate for four different temperatures: 10 degrees celsius, 20 degrees celsisus, 30 degree celsius, and 40 degree celsius, in separate tubes. The enzyme appears to work faster as temperature increases, but completely ceases activity at 40 degrees celcius. Sketch a graph to show this outcome, but here you will graph product formation (nmoles/mL) vs. time (minutes). The graph should be 4 lines and HANDDRAWN. Include a legend if necessary. You do not need precise quantitivate values, but most show the correct trends on the graph.arrow_forwardThe energetic equivalent of two molecules of ATP is used to activate an amino acid, yet only one molecule of ATP is used. Explain.arrow_forwardAt the left is an energy diagram that shows the energy changes for the example of glucose (C6H1206) being converted to CO2 + H2O. One curve is the reaction with enzymes, while the other is without enzymes. For these reactions, the "X" indicates: Glucose + 60g a) b) free energy of glucose free energy of activation without enzymes free energy of CO2 + H2O free energy released free energy of activation with d) e) Progrem af reaction enzymes Frec energy, Garrow_forward
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