IB Biology 2.5 Enzymes

What type of macromolecule are enzymes?

• Protein
• Carbohydrate
• Lipid
• Nucleic Acid

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NGSS.MS-LS1-7

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

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NGSS.HS-PS1-5

Enzymes are made up of these repeating monomers.

• monosaccharides
• amino acids
• nucleotides
• phospholipids

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NGSS.HS-LS1-6

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

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

The energy needed to start a reaction

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

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NGSS.HS-PS1-4

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 can denature enzymes.
• Enzymes speed up chemical reactions. 

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NGSS.HS-PS1-5

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.

Blocking Active site of an enzyme

• competitive inhibition
• allosteric inhibition

Which of these is most likely an enzyme?  

• Sucrose
• Galactose
• Fructose
• Amylase

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NGSS.MS-LS3-1

If a mutation occurs in a DNA sequence that codes for an enzyme, what is the most likely result?

• There will likely be no change in the shape and function of the enzyme.

• The enzyme will most likely fold in a way that makes its shape incompatible with the substrate and the enzyme will not function correctly.

• The enzyme will not be produced at all.

• The enzyme will have an enhanced ability to bind with the substrate.

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NGSS.HS-LS1-1

NGSS.HS-LS3-2