Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 4, Problem 6LTB
Summary Introduction
Introduction:
Activation energy is the minimum amount of energy which is required to start a
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What does it require for the necessary reactions to occur if there is the absence of enzymes?
choices: higher temp, larger cells, smaller atoms, larger proteins
Which of the following is NOT true about enzymes?
Enzyme inhibitors interact reversibly or irreversibly with an enzyme to alter its Km and /or Vmax values.
Enzymes typically act under milder conditions of temperature and pH than non-enzyme chemical catalysts.
Zymogens are the inactive precursors of enzyme.
Nucleophilic groups can catalyze reactions through the transient formation of covalent bonds with the substrate.
Transition state stabilization can significantly increase the activation energy for a reaction.
Which of the following statements is false regarding an enzyme's ability to catalyse a reaction?
an enzyme provides a reaction surface and a hydrophilic environment for the reaction to take place
an enzyme binds reactants such that they are positioned correctly and can attain their transition-state configurations
an enzyme allows the reaction to go through a more stable transition state than would normally be the case
an enzyme can weaken bonds in reactants through the binding process
Chapter 4 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
Ch. 4 - What is meant by the term induced fit?Ch. 4 - Prob. 2LTBCh. 4 - What are the reactants and products of cellular...Ch. 4 - Which of the following is a false statement...Ch. 4 - Enzymes speed up chemical reactions by...Ch. 4 - Prob. 6LTBCh. 4 - Prob. 7LTBCh. 4 - The electron transport chain ___________. is...Ch. 4 - Most of the energy in an ATP molecule is released...Ch. 4 - Anaerobic respiration ___________. generates...
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- An inactive form of an enzyme becomes active after being phosphorylated. When glucose is converted to glucose-6-phosphate by hexokinase, the accumulation of glucose-6-phosphate inhibits the reaction. A foreign substance is added to the reaction above. This substance binds to hexokinase and prevents its ability to catalyze the reaction.arrow_forwardSandra is a 30-year-old woman. After medical images and blood tests, Sandra's mother has just been diagnosed with breast cancer. Her mother's mother died of breast cancer several years ago. Should Sandra be concerned that she might be at higher risk for breast cancer herself? O Yes. While there does not seem to be a genetic link with breast cancer, she has been exposed to the same environmental factors as the rest of her family Yes. Some forms of breast cancer have been linked to a gene mutation which she may have inherited from her mother's side of the family O No. The causes breast cancer have not been completely identified so she is probably at no greater risk than any other woman in the population O No. Detection of and treatments for breast cancer have improved so dramatically in recent years that it is unlikely she would develop breast cancerarrow_forwardEnzymes are not used up in chemical reactions, so what exactly does an enzyme do? Refer to activation energy (transition state etc)arrow_forward
- Which of the following statements is not true? Metabolic pathways _____. a. occur in a stepwise series of chemical reactions b. are speeded up by enzymes c. may break down or assemble molecules d. always produce energy (such as ATP)arrow_forwardThe capacity to do work best defines: a metabolic pathway. entropy. kinetic or potential energy. a chemical equilibrium. thermodynamics.arrow_forwardEnzymes have all the following characteristics except: a. they act as biological catalysts b. they are proteins c. they carry out random chemical reactions d. they convert substrates into products e. they can cause genetic diseasearrow_forward
- Enzymes _______. a. enhance reaction rates b. are affected by pH c. act on specific substrates d. all of the abovearrow_forwardI have a project to construct a poster with the pathways that we have discussed in class which include glycolysis to beta-oxidation of fatty acids that are depicted inside a cell. I need to include reactions that are regulated, ones that produce or consume energy, and those at branch points between pathways. I also need a list of regulated enzymes and what regulates them. I also need to include intracellular membranes and locate reactions in the appropriate subcellular location. I can only include each metabolite once per subcellular location and include transporters. Any information that can be given to me on the different pathways and reactions would be helpful. I am at a loss and could use some help figuriong out what to put on my project. Thank youarrow_forwardWhich statement is true regarding an endergonic reaction/pathway? Group of answer choices They have a positive delta G. They require outside energy such as solar energy (e.g., photosynthesis). They are involved in cellular work (e.g., biosynthesis). All previous answers None of these answersarrow_forward
- Cells can control enzymatic activity by allosterically regulating enzymes, and through what other means? secretion of enzymes out of the cell altering internal pH altering cell temperature localization of enzymes into specific organelles or membranes assembly of large aggregates of the same enzymearrow_forwardEnzymes increase the rate of a chemical reaction by providing an alternative path with a lower activation energy. True Falsearrow_forwardWhich of the following statements are true for enzymes? Check all that apply. The activity of some enzymes can be modulated by allosteric effectors. All enzymes are more active when dephosphorylated. Enzymes are subjected to a rapid turnover. All enzymes are more active when phosphorylated. The activity of some enzymes can be modulated by regulatory proteins.arrow_forward
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Anaerobic Respiration; Author: Bozeman Science;https://www.youtube.com/watch?v=cDC29iBxb3w;License: Standard YouTube License, CC-BY