Enzyme Structure: Lock and Key Theory

Enzymes are:

• Are not living and are globular proteins.

• Are living and are globular proteins.

• Are living and are non-globular proteins.

• Are not living and are non-globular proteins.

Define the word substrate (choose best answer):

• The molecule that an enzyme acts on. It has a specific shape that fits the enzyme.

• The molecule that an enzyme acts on.

• The area where the molecule fits into an enzyme

• The shape of the active site

Define the word "active site" (choose best answer):

• The molecule that an enzyme acts on. It has a specific shape that fits the enzyme.

• The molecule that an enzyme acts on.

• The area where the molecule fits into an enzyme

• The area where the molecule fits.

Which is statement is true?

• Enzymes are biological catalysts which lower the activation energy needed to start a reaction by providing a alternative pathway

• Enzymes are biological catalysts which raise the activation energy needed to start a reaction by providing a alternative pathway

• Enzymes are live organisms which lower the activation energy in a pathway

• Enzymes are non-biological catalysts which lower the activation energy needed to start a reaction by providing a alternative pathway

Tags

NGSS.HS-PS1-5

Enzymes are considered to be 

• Lipids
• Carbohydrate
• Protein
• Nucleic Acid

Tags

NGSS.MS-LS1-7

What is the purpose of an enzyme?

• give permission for the biochemical reaction

• raise activation energy

• speed up biochemical reactions

• control how many reactions occur

Where do substrates bind on an enzyme?

• voltage-gated channels
• surface receptor
• calcium channels
• active site

Which of the following tasks listed below is most associated with enzymes?

• catalyze chemical reactions                  
• store genetic information       
• store chemical energy in the cell   
• dissolve nutrients and minerals 

Tags

NGSS.MS-LS1-7

Enzymes are examples of

• biological catalysts

• proteins

• macromolecules

• all of these are true

What is structure A?

• Substrate
• Active site
• Enzyme
• Products