Exam 2 for Biology 123 Lab
Questions and Answers 100% Pass
Proteins consist of __________ bonds - CORRECT ANSWER:-Polypeptide
Enzymes are almost always ________ - CORRECT ANSWER:-Proteins
What is a catalyst? - CORRECT ANSWER:-Speeds up a reaction without being
consumed or changed
What is specificity? - CORRECT ANSWER:-Has active site that binds to one
particular molecule (substrate) to catalyze specific reaction
Do cells require enzymes? Why or why not? - CORRECT ANSWER:-Yes, cells
require enzymes to allow reaction rates that support processes of life
List the steps on how enzymes work. - CORRECT ANSWER:-1. Substrate
binding - substrate binds to enzyme active site
2. Induced fit - substrate binding causes shape change in enzyme forming E-S
complex - substrate held more tightly
3. Product formation - Reaction occurs while substrates bound to enzyme
, 4. Enzyme shape changes - Releasing products and returning active site to original
shape
Using what you know about catalysts, describe what happens after one enzymatic
reaction occurs and products are released. - CORRECT ANSWER:-The enzyme is
"recycled" - NOT changed up or used
Ready to bind to more substrate
Will bind to substrate as soon as encountered as long as substrate is available
What is the maximum rate? - CORRECT ANSWER:-Fastest rate at which
enzymes active sites are occupied
How does an enzyme catalyze a reaction? - CORRECT ANSWER:-By binding to a
substrate and lowering the activation energy, causing the reaction to speed up
How is the activation energy lowered in an enzymatic reaction? - CORRECT
ANSWER:-Induced fit brings the reactant molecules closer together
This closeness puts more stress on the bonds and makes them easier to break
List the two different types of enzyme inhibitors and describe how each inhibits
enzymatic reaction. - CORRECT ANSWER:-Competitive inhibitor - Binds to
active site of enzyme to prevent substrate bonding
Non-competitive inhibitor - Binds somewhere else and alters active site to prevent
substrate bonding
pH 4 | pH 5 | pH 6 | pH 7 | pH 8 | pH 9 | pH 10
Questions and Answers 100% Pass
Proteins consist of __________ bonds - CORRECT ANSWER:-Polypeptide
Enzymes are almost always ________ - CORRECT ANSWER:-Proteins
What is a catalyst? - CORRECT ANSWER:-Speeds up a reaction without being
consumed or changed
What is specificity? - CORRECT ANSWER:-Has active site that binds to one
particular molecule (substrate) to catalyze specific reaction
Do cells require enzymes? Why or why not? - CORRECT ANSWER:-Yes, cells
require enzymes to allow reaction rates that support processes of life
List the steps on how enzymes work. - CORRECT ANSWER:-1. Substrate
binding - substrate binds to enzyme active site
2. Induced fit - substrate binding causes shape change in enzyme forming E-S
complex - substrate held more tightly
3. Product formation - Reaction occurs while substrates bound to enzyme
, 4. Enzyme shape changes - Releasing products and returning active site to original
shape
Using what you know about catalysts, describe what happens after one enzymatic
reaction occurs and products are released. - CORRECT ANSWER:-The enzyme is
"recycled" - NOT changed up or used
Ready to bind to more substrate
Will bind to substrate as soon as encountered as long as substrate is available
What is the maximum rate? - CORRECT ANSWER:-Fastest rate at which
enzymes active sites are occupied
How does an enzyme catalyze a reaction? - CORRECT ANSWER:-By binding to a
substrate and lowering the activation energy, causing the reaction to speed up
How is the activation energy lowered in an enzymatic reaction? - CORRECT
ANSWER:-Induced fit brings the reactant molecules closer together
This closeness puts more stress on the bonds and makes them easier to break
List the two different types of enzyme inhibitors and describe how each inhibits
enzymatic reaction. - CORRECT ANSWER:-Competitive inhibitor - Binds to
active site of enzyme to prevent substrate bonding
Non-competitive inhibitor - Binds somewhere else and alters active site to prevent
substrate bonding
pH 4 | pH 5 | pH 6 | pH 7 | pH 8 | pH 9 | pH 10
