Enzymes

Based on the names of the molecules, which of the following is an enzyme?

• lactose

• adenosine

• protease

• phosphate

How do enzymes speed up chemical reactions? Enzymes

• lower the activation energy of chemical reactions.

• raise the temperature of the cell, speeding chemical reactions.

• store ATP, allowing more energy to be used in chemical reactions.

• act as miniature "transfer trucks", gathering materials for chemical reactions, and placing them together.

Each enzyme produced by the body is

• open - meaning it is able to catalyze a reaction with any molecule.

• immature - meaning it cannot catalyze a reaction until many years later.

• incomplete - meaning it requires other parts before it is able to bind to a molecule.

• specific - meaning it is only able to catalyze a rection with a certain molecule.

Which of the following two factors affect an enzyme's operation the most?

• amount of light and temperature

• blood glucose and pH

• temperature and pH

• amount of light and pressure

Enzymes are a type of which macromolecule?

• carbohydrate

• lipid

• protein

• nucleic acid

What is activation energy?

• the energy from the sun

• the energy produced by an enzyme

• the energy needed to get a reaction going

• none of these

What does it mean when an enzyme is denatured?

• that there is an acid around

• that the enzyme works faster

• that it is providing energy for the cell

• that the shape is changed of the active site & it no longer works

Which labeled part is the substrate?

• letter A

• letter B

• letter D

• letter E

In the lock-and-key model of enzyme action, the __________ fits into the __________ of the enzyme.

• product; substrate

• active site; product

• substrate; active site

• active site; substrate

Which of the following best explains why enzymes are necessary for many cellular reactions?

• Enzymes supply the oxygen necessary for the reactions
•  Enzymes change reactants from solid to liquids during the reactions.
• The reactions take up too much space in the cell if the enzymes are missing.
• The reactions are too slow to meet the needs of the cell if enzymes are missing.