AP Biology Enzymes and Environment

What type of macromolecule are enzymes?

• Protein
• Carbohydrate
• Lipid
• Nucleic Acid

Which of the following correctly describes how enzymes work?  

• they lower the energy of the reactants to increase the rxn rate
• they supply energy to the reaction to increase the rxn rate
• they lower the energy of the products to increase the rxn rate
• they lower the activation energy of the reaction to increase the rxn rate

The part of the enzyme that the substrate bonds to is called the _____.

• active site
• activation energy
• bond site
• peptide bond

Which of these is NOT true?

• Enzymes can denature (change shape) when the temperature gets too high.

• Enzymes can only be used once in a chemical reaction.

• Extreme pH and salinity can denature enzymes.

• Enzymes speed up chemical reactions.

Which of the following is directly responsible for the shape of an enzyme/protein?

• The amino acid sequence of the protein and the properties of the amino acids that make up the protein.

• The temperature of the surrounding environment.

• The pH of the surrounding environment.

• The amount of substrate present.

In the diagram, what is letter A? 

• product
• substrate
• enzyme-substrate complex
• active site

Letter D...

• active site
• enzyme
• substrate
• products

Letter B...

• active site
• enzyme
• substrate
• products

Based on the graph, what is the optimal temperature for this enzyme? 

• 15^oC
• 40^oC
• 30^oC
• 35^oC

The energy needed to start a reaction

• activation energy
• adhesion energy
• chemical energy
• cohesion energy