Bio 103 Enzymes Quiz
potential
energy an object has because of the position it is in; stored energy available to do work
activation energy
energy required to start a chemical reaction
kinetic
energy used to do work; energy in motion
energy
the ability or capacity to do work
kilocalorie
1000 calories; unit of heat
false
A molecule that gains an electron has been oxidized.
reduction
A reaction in which a molecule or atom gains an electron is called __
oxidation
A reaction in which a molecule or atom loses an electron is called __.
lactase
An enzyme that digests lactose
catalase
An enzyme that works on hydrogen peroxide
true
Catalysts produced in living things are called enzymes.
allosteric site
During noncompetitive inhibition, the inhibitor binds to
true
Enzyme activity can be influenced by environmental conditions.
protein
Enzymes are composed of
true
Enzymes are sensitive to changes in temperature and pH.
amylases
Group of enzymes that work on carbohydrates
lipases
Group of enzymes that work on lipids
proteases
Group of enzymes that work on proteins
key
In the lock or key model, the enzyme is th
-ase
Most enzyme names end in
co-factors
Non-organic elements that aid in enzyme catalyzed reactions; Examples include zinc &copper
co-enzymes
Organic compounds that aid in enzyme catalyzed reactions; Examples include vitamins
true
Reduction and oxidation reactions take place together
noncompetitive inhibition
What type of inhibition occurs when a molecule binds to the enzyme causing the active site to change shape?
competitive inhibition
What type of inhibition occurs when a molecule blocks the active site so the substrate and enzyme can not fit together?
B
Which of the following is NOT true concerning catalysts? Select one: a. Catalysts speed up reactions. b. Catalysts are reactants in the reaction.. c. Catalysts lower activation energy d. Catalysts are reusable.
C
Which of the following is NOT true concerning enzymes? Select one: a. Enzymes have a specific shape. b. Enzymes do the same job as catalysts. c. Enzymes raise activation energy d. Enzymes make reactions occur faster.
A
Which of the following statements is TRUE concerning pH and enzyme activity? Select one: a. Stomach enzymes work best at low pHs. b. All enzymes work best at neutral pHs.
B
Which of the following statements is TRUE concerning temperature and enzyme activity? Select one: a. All enzymes function best at the same temperature. b. Cooking temperatures denature (causes the enzyme to lose its shape) the enzyme. c. Colder temperatures increases enzyme activity.
lock
in the lock or key model, the substrate is the
exergonic
reactants have more energy than the products; reaction that releases energy as light or heat; also called catabolic; occur spontaneously
endergonic
reactions that absorb energy; reactions that feel cold; also called anabolic; reactants have less energy than the products
calorie
the energy required to raise 1 gram of water 1 degree Celsius
active site
the point at which the enzyme binds
substrates
the reactants involved in an enzyme catalyzed reaction
true
the shape of an enzyme is not important to its function.
Thermodynamics
the study of energy & energy transformation
