Biochemistry Quiz

What does the first law of thermodynamics state?

• Energy cannot be created or destroyed

• Energy can be transferred between organisms

• Energy is spontaneously released as heat

• Energy cannot be transformed

Which process describes the breakdown of biochemical fuels to extract energy?

• Anabolism

• Photosynthesis

• Catabolism

• Phosphorylation

What type of process occurs when entropy increases?

• Non-spontaneous

• Spontaneous

• Endergonic

• Exergonic

Which term is used for the energy available to do work?

• Enthalpy

• Gibbs free energy

• Kinetic energy

• Thermal energy

A negative ΔG in a reaction indicates that the process is:

• Endergonic

• Non-spontaneous

• Exergonic

• At equilibrium

What does a positive ΔH represent in a reaction?

• Endothermic process

• Exothermic process

• Decreased entropy

• Spontaneous reaction

Which term is used to describe a reaction that absorbs heat?

• Exothermic

• Spontaneous

• Endothermic

• Catalytic

What is the equation for Gibbs free energy?

• ΔG = ΔH - TΔS

• ΔG = ΔS - TΔH

• ΔS = ΔH - TΔG

• ΔH = TΔS + ΔG

If the free energy change (ΔG) of a reaction is zero, what can be concluded?

• Reaction is exergonic

• Reaction is endergonic

• Reaction is spontaneous

• Reaction is at equilibrium

Which of the following defines entropy (ΔS)?

• A measure of disorder or randomness

• A measure of heat absorbed

• A measure of the energy used to perform work

• The energy required to start a reaction