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Explain how temperature, pH, and enzyme inhibitors can affec

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dana downen

on 23 October 2013

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Transcript of Explain how temperature, pH, and enzyme inhibitors can affec

Chapter 6 Study Guide
Kylie, Dana, and Brianna

Explain how temperature, pH, and enzyme inhibitors can affect an enzyme
Describe two ways to make ATP
Differentiate between competitive and noncompetitive inhibitors and feedback inhibition
Temperature can affect enzyme activity because enzymes are made of proteins. If the temperature raises, the proteins molecular structure will become more unstable until it denatures and breaks apart.
pH is essentially the same where the enzyme will denature if it is too acidic or too basic of an environment.
Enzyme Inhibitors
Cofactors are molecules that fit into the active site of an enzyme that will activate and deactivate. Therefore, enzyme inhibitors are molecules that fit into an enzyme and prevemt the cofactor from reaching it and activating it.
Substrate Level Phosphorylation
Enzyme directly transfers from one molecule to another molecule
Energy in an electrochemical gradient is used to make ATP from ADP and Pi
Competitive inhibitors compete with the substrate for the same active site (occupying the active site and also preventing substrates from binding).
Noncompetitive inhibitors bind to the enzyme in a location other that the active site, changing the shape of the enzyme and making it unable to bind to the substrate.
Feedback Inhibition
Product of pathway inhibits early steps to prevent over-accumulation of product
Explain the various ways in which enzymes increase the rate of biological reactions. (pg 123)
Various Way #1
Enzy,es lower the activation energy barrier but do not affect equilibrium of the chemical reaction
Various Way #2
Enzyme action does not alter the difference in free energy; only the rate of reaction
Various Way #3
Enzymes accelerate both the forward and reverse reactions, reducing the time it takes to reach equilibrium.
Explain aspects of the chemical environment such are amounts of substrate or enzymes/temperature and pH affect enzyme activity.
In environmental conditions such as pH and temperature, they might change the three dimensional shape of an enzyme, altering its rate of activity or its ability to bind substrate.
What are the two ways to make ATP?
A. Oxidation and redox reaction
B. Gene and Cellular regulation
C. Substrate phosphorylation and Chemiosmosis
D. Exocytosis and Endocytosis
C. Substrate level phosphroylation and Chemiomsosis
Which is the process in which energy is stored in an ion electrochemical gradient used to make ATP from ADP and Pi?
A. Biochemical Regulation
B. Metabolic Pathway
C. Chemiosmosis
C. Chemiosmosis
This inhibition is the final product of the metabolic pathway which inhibits an enzyme that functions in the pathway?
A. Feedback
B. Competitive
C. Uncompetitive
A. Feedback
Uncompetitive inhibitor does not change the shape of an enzyme, allowing it to bind to the substrate.
A. True
B. False
Enzymes are made of
A. Ribosomes
B. Carbohydrates
C. Proteins
D. Glucose
C. Proteins
Which type of factor is a molecule that fits into the active site of an enzyme that will activate and deactivate?
A. Nofactor
B. Myfactor
C. Cofactor
D. None of the Above
C. Cofactor
This allows us to find out if the substance is acidic or basic...
A. pH
B. the teacher
C. the color or substance
A. pH..DUH!
During environmental change, the shape of an enzyme will never change.
A. True
B. False
B. False
Environmental changes can affect the activity or the ability for an enzyme to bind to a substrate
A. True
B. False
A. True
________ increase the rate of biological reactions
A. Atoms
B. Enzymes
C. Light
D. AIr
B. Enzymes
Enzymes can lower the activation energy barrier
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