Bio 103 Enzymes Quiz

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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


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