Chemical reactions and enzymes

Enzymes are an example of which macromolecule?

• Lipids

• Carbohydrate

• Protein

• Nucleic Acid

Tags

NGSS.HS-LS1-1

What is a substance called if it speeds up a chemical reaction by lowering activation energy?

• substrate

• catalyst
• reactant

• key

Tags

NGSS.HS-PS1-5

Letter D is which of the following?

• enzyme active site

• enzyme
• substrate
• products

Letter B is which of the following?

• enzyme active site

• enzyme
• substrate
• products

Letter C is which of the following?

• enzyme active site

• enzymes
• substrate
• products

Tags

NGSS.HS-PS1-2

Letter E is which of the following?

• enzyme active site

• enzyme
• substrate
• products

An enzyme speeds up a reaction by

• lowering the activation energy.
• raising the activation energy.
• releasing energy.
• absorbing energy.

What happens when enzymes are heated to a temperature above optimal temperature?

• The enzymes die.

• The enzyme becomes denatured (unfolded)

• The enzymes' amino acid sequence changes.

• The enzymes remain the same

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. 

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

• Enzymes increase the energy of the reactants.
• Enzymes decrease the energy level of the products.
• Enzyme decrease the activation energy of the reaction.
• Enzymes reverse the direction of the reaction.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-5