Enzymes Test

What is one difference between enzymes and coenzyme?

• coenzymes are destroyed by chemical reactions
• enzymes are smaller than coenzymes
• enzymes are organic; coenzymes are inorganic

• enzymes are proteins; coenzymes may be other substances

What would result if enzymes were not present in a cell?

• foods would turn an unappealing color
• the body would metabolize nutrients too quickly
• cells would die from the lack of chemical reactions

• all of the above

Tags

NGSS.HS-LS2-3

Which of the following substances would be MOST effective in preventing enzymatic browning?

• an antioxidant, such as lemon juice
• a base such as baking soda
• living cells, such as yeast
• all would be equally effective

What allows a particular enzyme to work on a particular substrate?

• their pH levels neutralize one another
• they fit at the active site
• they contain the same amino acids
• they carry opposite electrical charges

Which treatment is MOST effective at stopping enzyme activity?

• blanching
• soaking in water
• changing the pH
• all are equally effective

A(n) ___ enzyme has lost the ability to bring about a chemical reaction.

• amphipathic
• hydrophilic
• hydrophobic
• denatured

Enzymes are used in food preparation to ____ cuts of meat that would otherwise be difficult to chew.

• tenderize
• coenzyme
• oxygen
• toughen

Tightly sealing food packages slows enzyme activity by limiting exposure to the ____ in the atmosphere.

• carbon dioxide
• oxygen
• nitrogen
• hydrogen

An ezyme can't catalyze a chemical reaction can't take place unless the substrate matches the ___ of an enzyme.

• active site
• peptide bond
• alpha helix
• beta pleated sheet

Lemon juice prevents enzymatic browning because it ____.

• limits oxygen
• denatures the enzyme
• increases the pH
• only changes the taste