Bio - Unit 2, Chapter 6, Lesson 3

What is the term for the energy needed to get a reaction started?

• Activation energy

• Kinetic energy

• Potential energy

• Thermal energy

What is the active site of an enzyme?

• A region on an enzyme that binds to the substrate

• A part of the enzyme that releases energy

• A section of the enzyme that stores nutrients

• A location on the enzyme that breaks down proteins

What is a catalyst?

• A substance that slows down a chemical reaction

• A substance that speeds up the rate of a chemical reaction and is reusable

• A substance that changes color during a reaction

• A substance that is consumed in a reaction

In biological reactions, what are catalysts commonly known as?

• Hormones

• Vitamins

• Enzymes

• Proteins

What is a chemical reaction?

• The process by which one or more substances change to produce one or more different substances

• The process of mixing substances without any change

• The process of heating substances to increase temperature

• The process of cooling substances to decrease temperature

What happens when particles combine in a chemical reaction?

• They form a new substance

• They disappear

• They remain unchanged

• They become smaller

What is denaturation in proteins?

• A change in the shape of a protein caused by changes in temperature or pH.

• The process of protein synthesis in the ribosome.

• The breakdown of proteins into amino acids.

• The formation of peptide bonds between amino acids.

What does the term "endothermic" mean?

• Releases heat

• Absorbs heat

• Produces light

• Emits sound

What is an enzyme?

• A type of carbohydrate

• A protein that speeds up a biological reaction

• A lipid that stores energy

• A nucleic acid that carries genetic information

How do enzymes affect biological reactions?

• They increase the activation energy needed

• They decrease the activation energy needed

• They do not affect the activation energy

• They stop the reaction completely