Biological Reactions

A process that changes one set of chemicals into a new set of chemicals.

• chemical reaction

• physical reaction

• synthetic reaction

• chemical production

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____ are the elements and compounds that go into a reaction.

• Reactants

• Products

• Molecules

• Ingredients

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___ are the elements and compounds that are created by a reaction.

• Products

• Reactants

• Molecules

• Ingredients

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The energy needed to start a reaction is called the

• activation energy

• starting energy

• promoting energy

• reacting energy

A catalyst is an enzyme that

• A) speeds up the rate of a reaction.

• B) reduces the amount of energy needed for a reaction to start.

• Both A and B are correct

• Neither A nor B are correct

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NGSS.HS-PS1-5

Enzymes contain a(n) ___ where reactants can bond to react with each other.

• active site

• reaction site

• substrate site

• enzyme site

Once an enzyme has helped a reaction take place, it can then

• be reused for another reaction with the same reactants.

• be broken down.

• be stored in the cell until it is needed again.

• be used to help different reactants go through a reaction.

Some factors can change the shape of an enzyme and when an enzyme's shape has changed it no longer works. When this happens we say that the enzyme has been ___.

• denatured

• altered

• modified

• renatured

Which of the following can cause a protein's shape to change?

• A) pH

• B) high temperatures

• Both A and B

• Neither A nor B

Compare the two pathways, which pathway shows the reaction that has taken place with the help of an enzyme?

• Pathway 1

• Pathway 2

• You cannot tell from these graphs.

• Both reactions involved an enzyme.

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NGSS.HS-PS1-2

NGSS.HS-PS1-5