Biology Quiz on Metabolism and Enzymes

What is the primary role of ATP in cellular work?

• It stores genetic information.

• It powers cellular work by coupling exergonic reactions to endergonic reactions.

• It acts as a structural component of cell membranes.

• It serves as a neurotransmitter.

How do enzymes affect metabolic reactions?

• They increase the temperature of the reaction.

• They speed up reactions by lowering energy barriers.

• They change the products of the reaction.

• They slow down reactions by increasing energy barriers.

What does the free-energy change of a reaction indicate?

• The color of the reactants.

• The speed of the reaction.

• Whether or not the reaction occurs spontaneously.

• The temperature at which the reaction occurs.

What is one of the functions of metabolism in an organism?

• To transform energy, subject to the laws of thermodynamics.

• To produce light in all organisms.

• To create new genetic material.

• To eliminate all chemical waste.

What is the definition of metabolism?

• The process of breathing in oxygen and exhaling carbon dioxide

• The sum total of biochemical reactions required for life

• The conversion of food into energy through digestion

• The breakdown of proteins into amino acids

What is a metabolic pathway?

• A random series of chemical reactions

• A step-wise set of reactions that begins with a specific molecule and ends with a product

• A single reaction catalyzed by multiple enzymes

• A process that does not involve enzymes

What role do enzymes play in a metabolic pathway?

• They inhibit the reactions

• They catalyze each step of the reactions

• They are not involved in the reactions

• They are the final product of the reactions

What is the starting point of a metabolic pathway?

• The final product

• A specific molecule

• An enzyme

• A random compound

What is the end result of a metabolic pathway?

• A specific enzyme

• A random molecule

• A product

• A starting molecule

What is the main theme depicted in the diagram?

• Cellular respiration

• Photosynthesis

• Metabolic networks

• Protein synthesis