What are enzymes commonly referred to as?

• "Helper" Protein molecules

• "Builder" Carbohydrate molecules

• "Carrier" Lipid molecules

• "Messenger" Nucleic acid molecules

Why are enzymes described as "helper" molecules in biological processes?

• They provide energy for cells

• They help speed up chemical reactions

• They store genetic information

• They transport oxygen in the blood

Based on the diagram, what is the role of the enzyme in the reaction?

• The enzyme is consumed in the reaction

• The enzyme changes shape permanently

• The enzyme helps the substrate change and is reused

• The enzyme becomes a product of the reaction

Based on the images, which organism is most likely to obtain energy directly from the sun?

• Lion

• Giraffe

• Both lion and giraffe

• Neither lion nor giraffe

Which term is used to describe enzymes because they speed up chemical reactions?

• Reactants

• Catalysts

• Substrates

• Inhibitors

What is the difference between anabolic and catabolic enzymes?

• Anabolic enzymes break down molecules, while catabolic enzymes build molecules.

• Both anabolic and catabolic enzymes only build molecules.

• Anabolic enzymes build molecules, while catabolic enzymes break down molecules.

• Both anabolic and catabolic enzymes only break down molecules.

Why does each enzyme need to be the right shape?

• To fit into the cell membrane

• To perform its specific job in a reaction

• To dissolve in water

• To store energy

What is the main function of the active site in an enzyme?

• It stores energy for the enzyme.

• It binds to the substrate to form a substrate-enzyme complex.

• It breaks down the enzyme.

• It produces new enzymes.

Explain why enzymes can be used repeatedly in biochemical reactions. Use evidence from the information provided.

• Because enzymes are changed by the reaction.

• Because enzymes are only used temporarily and are not changed by the reaction.

• Because enzymes are destroyed after each reaction.

• Because enzymes are made of substrates.

Based on the diagram, what happens to enzyme activity as temperature or pH increases to an optimal point and then continues to rise?

• Enzyme activity keeps increasing

• Enzyme activity decreases after reaching an optimal point

• Enzyme activity remains constant

• Enzyme activity stops immediately