LAS 4 Enzymes Quiz

Enzymes are:

• Lipids that catalyze reactions

• Proteins that catalyze reactions

• Carbohydrates that slow down reactions

• None of the above

The optimum pH for salivary amylase activity is:

• 5.5

• 6.8

• 7.5

• 8.5

Which of the following is used to test for the presence of starch?

• Benedict's solution

• Biuret reagent

• Iodine solution

• None of the above

What is the function of liver catalase?

• Breaks down glucose into maltose

• Converts starch into glucose

• Decomposes hydrogen peroxide into water and oxygen

• Denatures proteins

Enzymes are specific to their substrates because of their:

• Polarity

• Size

• Active site

• Allosteric site

Which color change indicates the presence of starch when iodine is added?

• Red to yellow

• Blue to black

• Purple to green

• No color change

What happens when enzymes are exposed to temperatures above their optimal range?

• They become more active

• They denature and lose function

• They speed up the reaction indefinitely

• No effect

Which of the following is NOT a factor affecting enzyme activity?

• pH

• Substrate concentration

• Light intensity

• Temperature

Amylase breaks down starch into:

• Glucose

• Maltose

• Dextrins

• All of the above

The term "enzyme" comes from the Greek words meaning:

• Protein and catalyst

• Within and yeast

• Cell and reaction

• Fast and efficient