Biology Today and Tomorrow without Physiology (MindTap Course List)
5th Edition
ISBN: 9781305117396
Author: Cecie Starr, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 4, Problem 6SQ
Summary Introduction
Introduction: An enzyme is a substance that acts as a macromolecular biological catalyst in living things. It is made up of proteins that folded into complex forms and found throughout the body. The reaction is speed by the enzymes by reducing activation energy. Thus, it drops the barrier that avoids the occurrence of reactions.
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________ is a regulatory mechanism in which the end product of a metabolic pathway inhibits an enzyme that catalyzes an early step in the pathway.
a.
Cooperative inhibition
b.
Feedback inhibition
c.
Allosteric inhibition
d.
Non-competitive inhibition
e.
Metabolic inhibition
Item 35
Organic cofactors are referred to as _________.
Fill in the blank
36
Item 36
Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the
Multiple Choice
a. allosteric site, and its effectiveness is not influenced by substrate concentration.
b. allosteric site, and its effectiveness depends on substrate concentration.
c. active site, and its effectiveness is not influenced by substrate concentration.
d. active site, and its effectiveness depends on substrate concentration.
e.substrate, and its effectiveness depends on product concentration.
Item 35
Organic cofactors are referred to as _________.
Fill in the blank
Item36
Item
Item 36
Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the
Multiple Choice
a. allosteric site, and its effectiveness is not influenced by substrate concentration.
b. allosteric site, and its effectiveness depends on substrate concentration.
c. active site, and its effectiveness is not influenced by substrate concentration.
d. active site, and its effectiveness depends on substrate concentration.
e. substrate, and its effectiveness depends on product concentration.
Item37
Item 37
A substance that binds to the active site of an enzyme and turns it off is called a _________ inhibitor.
Fill in the blank
Item 38
Lactase is an enzyme that digests lactose.
True or False
Item 39
Exergonic reactions do not require activation energy.
True or False
Chapter 4 Solutions
Biology Today and Tomorrow without Physiology (MindTap Course List)
Ch. 4 - Figure 4.5 Energy inputs and outputs in chemical...Ch. 4 - Figure 4.10 Enzymes, temperature, and pH. Each...Ch. 4 - Prob. 3FIOCh. 4 - Prob. 4FIOCh. 4 - The genus Ferroplasma consists of a few species of...Ch. 4 - Prob. 2DIDCh. 4 - Prob. 3DIDCh. 4 - Prob. 1SQCh. 4 - Prob. 2SQCh. 4 - Prob. 3SQ
Ch. 4 - Prob. 4SQCh. 4 - Prob. 5SQCh. 4 - Prob. 6SQCh. 4 - Prob. 7SQCh. 4 - Prob. 8SQCh. 4 - Ions or molecules tend to diffuse from a region...Ch. 4 - Prob. 10SQCh. 4 - Prob. 11SQCh. 4 - Prob. 12SQCh. 4 - A transport protein requires ATP to pump sodium...Ch. 4 - Prob. 14SQCh. 4 - Prob. 15SQCh. 4 - Prob. 1CTCh. 4 - Water molecules tend to diffuse in response to...Ch. 4 - Dixie Bee wanted to make JELL-O shots for her next...Ch. 4 - The enzyme trypsin is sold as a dietary enzyme...Ch. 4 - Prob. 5CT
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- Which of the following factors can denature an enzyme? 1. Competetive inhibitors 2.Extreme pH 3.Presence of heavy metals 4.Extremely high temperatures A. All of the above B.None of the above C. 4 only D. All factors except 1arrow_forwardThe ability of an enzyme’s active sites to bind only substrates of compatible shape and charge is known as ________.a. selectivityb. specificityc. subjectivityd. specialtyarrow_forwardThe mechanism in which the end product of a metabolic pathway inhibits an either step in the pathway is known as A. Reversible inhibition B. Metabolic inhibition C. Feedback inhibition D. Allosteric inhibition E. Noncoopetative inhibitionarrow_forward
- Most enzymes are made up of proteins and therefore may be inactivated by A. changes in temperature B. changes in pH C. salt concentration D. all of the abovearrow_forward_______are always changed by participating in a reaction. a. Enzymes c. Reactants b. Cofactors d. Coenzymesarrow_forwardAn enzyme-substrate solution has been "poisoned" with a noncompetitive inhibitor. It is expected that the addition of more substrate to the solution will _____ the activity of the enzyme. a. increase b. decrease c. have no effect onarrow_forward
- A metabolic pathway_____ . a. may build or break down molecules b. generates heat c. can include redox reactions d. all of the abovearrow_forward____________is another term for biosynthesis.a. Catabolism b. Anabolism c. Metabolism d. Catalystarrow_forwardIn order to inactivate enzymes involved in cancer, chemists at pharmaceutical companies search for _______ that would ____ the enzyme’s active site. Select one: a. elements, bind to b. molecules, bind to c. elements, repel d. molecules, repelarrow_forward
- The energy currency used by cells is ________. a. ATP b. ADP c. AMP d. adenosinearrow_forwardThe following statement can be said about enzymes: A. lowers activation energy of reactions B. regulates chemical activities in the body C. 3D shape is essential for normal function D. all of these E. B and C onlyarrow_forwardThe lock-and-key theory described the action of ______. Select one: a. enzymes as locks that fit other enzymes b. substrates as locks that fit different enzymes c. enzymes as keys that fit different chemicals d. substrates as keys that fit different enzymesarrow_forward
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