Homeostasis Feedback, Enzymes, and Immune System

How do enzymes affect the activation energy of a biological reaction?

• Enzymes increase the activation energy required for a biological reaction.

• Enzymes decrease the activation energy required for a biological reaction.

• Enzymes have no effect on the activation energy of a biological reaction.

• Enzymes convert activation energy into kinetic energy during a biological reaction.

What is necessary for an enzyme to facilitate a biochemical reaction?

• An allosteric inhibitor must bind to the enzyme.

• A substrate must attach to the enzyme's active site.

• A cofactor must bind to the enzyme's allosteric site.

• A competitive inhibitor must bind to the enzyme's active site.

Pepsin is an enzyme that requires an acidic environment to function. Which type of medication would most likely disrupt its activity?

• A medication that increases stomach pH

• A medication that enhances blood circulation

• A medication that reduces nerve sensitivity

• A medication that decreases blood sugar levels

What is the importance of maintaining a constant internal environment for enzyme function?

• Enzymes can become denatured with changes in pH and temperature

• Enzymes need variable conditions to work effectively

• Enzymes are unaffected by environmental changes

• Enzymes can adjust to any conditions without losing activity

The diagram illustrates a process that regulates a physiological condition in the human body. This process is an example of

• Homeostasis

• Cellular respiration

• A feedback mechanism

• A reflex action

How does the human body maintain stable levels of oxygen and carbon dioxide?

• Through the process of cell division.

• By utilizing feedback mechanisms.

• By altering the DNA sequence in cells.

• By keeping the internal environment constant.

When a person experiences changes in external temperatures, they may start to sweat or shiver. These physiological responses help the body to

• Disrupt the body's natural feedback mechanisms.

• Increase the production of insulin for better blood flow.

• Maintain homeostasis by regulating internal conditions.

• Cause skin and muscle cells to lose equilibrium.

When a cat arches its back and its fur stands on end, it is responding to a threat. This reaction is an example of

• Instinctive behavior

• Social interaction

• Detection and response to stimuli

• Thermoregulation

What type of microorganism is responsible for causing AIDS?

• A bacterium

• A virus

• A protozoan

• A yeast

Why are immunosuppressive drugs necessary for patients who have received an organ transplant?

• To prevent the immune system from attacking the transplanted organ

• To enhance the production of antibodies against the transplanted organ

• To increase the DNA compatibility between donor and recipient

• To eliminate any potential infections from the transplanted organ