Principles of Biology I with Lab Module 7 Lecture Quiz

Reactions that need assistance (energy) to start are called

• endergonic reactions.

• exergonic reactions.

• chemical reactions.

• physical reactions.

Potential energy can best be defined as

• not active but can become active.

• not active.

• active.

• active but can become inactive.

Which statement most accurately describes the second law of thermodynamics?

• Energy cannot be created or destroyed.

• Energy can be created or destroyed but it cannot be transformed.

• Energy cannot be changed from one form to another without a loss of usable energy.

• One usable form of energy can be completely converted into another usable form.

• Energy cannot be created nor destroyed but it can be changed from one form to another.

Which energy association is correct?

• Kinetic energy is energy of motion.

• Light energy is a form of chemical energy.

• Water stored behind a dam is an example of kinetic energy.

• Potential energy must be used immediately or it is lost.

• Energy in the chemical bonds of a molecule is kinetic energy.

What is a metabolic reaction called that involves one reaction releasing energy to provide energy for a second reaction that requires energy?

• an endergonic reaction

• a reversible reaction

• anabolism

• a coupled reaction

• an exergonic reaction

Enzymatic reactions can be controlled by:

• All of these

• Substrate concentration

• Temperature

• pH

During an enzymatic reaction, what happens to the enzyme?

• It is used up.

• It becomes the product.

• The enzyme and the substrate form a permanent complex.

• The enzyme and the substrate form a temporary complex.

• It becomes the substrate.

Which of the following molecules is an enzyme?

• uric acid

• lactose

• DNA

• lipase

• maltose

The place where the substrate fits onto the enzyme is called the

• active site.

• inhibitor site.

• receptor site.

• enzyme-substrate complex.

• enzyme-inhibitor complex.

Which is true about energy of activation?

• Adding the correct enzyme can lower the energy of activation.

• Energy of activation is the difference between the energy of the reactant and the energy of the product.

• Energy of activation is measured as the energy that is released after a reaction occurs.

• In any one metabolic pathway, all steps will have the same energy of activation.

• The energy of activation is always lower than the energy of the reactant.