Unit 7: Metabolism and Enzymes Quiz

The ability to cause change or do work is known as

• metabolism
• ups
• energy
• enzymes

Protease breaks down what macromolecule and turns them into amino acids, while also helping keep bacteria, yeast, and protozoa out of the intestines?

• carbohydrates
• proteins
• lipids
• nucleic acids

A 9th grade Biology student performed a lab in which 5 paper disks, soaked in varying concentrations of catalase, were placed into a solution of hydrogen peroxide. Catalase is an enzyme which catalyzes the breakdown of hydrogen peroxide into water and oxygen gas. The paper disks initially sink, but as the oxygen gas builds up on the surface of the paper disks they begin to float. The student timed how long it took for all of the disks to float in each of the different concentrations. The data table below displays the collected data. What effect did the catalase concentration have on the amount of time needed for all of the disks to float and why?

• An increased catalase concentration caused the amount of time to be higher.
• An increased catalase concentration caused the amount of time to be lower because it lowered the activation energy needed.
• An increased catalase concentration caused the amount of time to be higher because it lowered the activation energy.
• An increased catalase concentration caused the amount of time to be lower because it increased the activation energy.

H-amine HCL is an inhibitor of the catalase/hydrogen peroxide reaction. What effect would the addition of H-amine HCL have on the time needed for the 100% catalase disks to float and why?

• The amount of time would increase because H-amine HCL interferes with the binding of the substrate to the enzyme..
• The amount of time would decrease because H-amine HCL interferes with the binding of the substrate to the enzyme.
• The amount of time would increase because H-amine HCL increases binding with the substrate and enzyme.
• The amount of time would decrease.

Which is NOT a law of thermodynamics

• The energy of the universe is constant
• An object in motion stays in motion unless acted on by an opposing force
• During every energy transfer/transformation, some energy is lost (e.g. heat energy)

The picture is an example of what model of how enzymes work?

• Induced Fit
• Lock & Key
• Active Site

Lactose, a sugar found in dairy products, is broken down by which major digestive enzyme?

• Amylase
• Lipase
• Protease
• Lactase

Which is most similar to the process of competitive inhibition?

• You can't park because a bulldozer comes along and smashes your car away from the spot.
• You can't park because the car of the person next to you has taken up just enough space that you cannot fit your own car in.
• You can't park in your spot because someone with a car almost exactly like yours has already taken your spot, leaving you nowhere to park your car.

Enzymes are proteins that are used to _________ chemical reactions in our bodies, by ____________ the activation energy needed.

• slow down, increasing
• slow down, decreasing
• speed up, increasing
• speed up, decreasing

Which conclusion can be drawn from the following graph?

• the optimum pH of the enzyme is 6.6
• The enzyme’s activity increases as pH increases 5.0 to 9.0
• The optimum pH of the enzyme is 5.8
• The enzyme’s activity is greater around pH of 8.0 .