Understanding Metabolism

What is a common misconception about metabolism?

• It only occurs in animals.

• It only involves weight loss.

• It is related to cellular respiration.

• It is the same as digestion.

How do chemists view a cell?

• As a static structure.

• As a highly active chemical system.

• As a single molecule.

• As a simple organism.

What is the primary difference between anabolic and catabolic reactions?

• Both reactions build molecules.

• Both reactions break down molecules.

• Anabolic reactions build molecules, while catabolic reactions break them down.

• Anabolic reactions break down molecules, while catabolic reactions build them.

What happens to the molecules from an apple after digestion?

• They are stored as fat.

• They are expelled as waste.

• They are transformed into parts of the cell.

• They remain unchanged.

What is the main function of energy molecules produced by cells?

• To transport oxygen.

• To store genetic information.

• To power cellular activities.

• To build cell walls.

What is the significance of the citric acid cycle?

• It is unrelated to energy production.

• It is a minor metabolic pathway.

• It is the core of cellular metabolism.

• It only occurs in plants.

What are the waste products of the citric acid cycle in humans?

• Nitrogen and methane.

• Carbon dioxide and water.

• Hydrogen and oxygen.

• Oxygen and glucose.

Why is the citric acid cycle considered nearly universal among species?

• It is not essential for life.

• It is a recent evolutionary trait.

• It is found in almost all studied species.

• It only occurs in mammals.

How do certain bacteria use the citric acid cycle differently?

• They do not use the citric acid cycle.

• They use it to break down water.

• They run it in reverse to build large carbon molecules.

• They use it to produce oxygen.

What is a possible implication of the reverse citric acid cycle?

• It is a recent evolutionary development.

• It is less efficient than the normal cycle.

• It may have predated life itself.

• It only occurs in humans.