Biochemical Reactions and Thermodynamics

The video tutorial introduces biochemical reactions, focusing on thermodynamics, entropy, and Delta G. It explains the first and second laws of thermodynamics, highlighting energy conservation and entropy increase. The tutorial covers spontaneous and non-spontaneous reactions, coupled metabolic reactions, and the role of enzymes in reaction rates. It concludes with an overview of different types of biochemical reactions and enzyme classes.

What does the first law of thermodynamics state about energy?

• Energy can change forms but cannot be created or destroyed.

• Energy is always increasing in a system.

• Energy is only present in living organisms.

• Energy can be created and destroyed.

How does entropy change when water turns from ice to steam?

• Entropy decreases.

• Entropy remains constant.

• Entropy fluctuates randomly.

• Entropy increases.

What happens to the entropy of a system when a small molecule becomes part of a larger complex molecule?

• Entropy decreases.

• Entropy becomes zero.

• Entropy remains unchanged.

• Entropy increases.

Which of the following is true for a spontaneous reaction?

• It requires continuous energy input.

• It has a positive Delta G.

• It cannot occur in living cells.

• It occurs naturally without external intervention.

In a coupled reaction, what determines if the overall reaction is spontaneous?

• The individual Delta G values are positive.

• The sum of the individual Delta G values is negative.

• The reaction occurs in a living cell.

• The reaction requires an enzyme.

What is the role of ATP in glycolysis?

• It acts as a reactant.

• It provides energy through hydrolysis.

• It is a waste product.

• It inhibits the reaction.

How do enzymes affect chemical reactions?

• They lower the activation energy required.

• They increase the amount of product formed.

• They slow down the reaction rate.

• They change the equilibrium of the reaction.

Which type of reaction involves the transfer of electrons?

• Isomerization

• Hydrolysis

• Group transfer

• Oxidation-reduction

What is the function of transferases in biochemical reactions?

• They break chemical bonds.

• They catalyze oxidation-reduction reactions.

• They transfer specific groups between molecules.

• They convert molecules into isomers.

Which class of enzymes catalyzes the joining of two molecules?

• Isomerases

• Hydrolases

• Ligases

• Liases