Metabolism

What is the main role of the living cell in metabolism?

• It acts as a storage unit for energy.

• It functions as a miniature chemical factory where reactions occur.

• It produces light in all organisms.

• It only extracts energy but does not use it.

What is an example of organisms converting energy into light?

• Photosynthesis in plants

• Fermentation in yeast

• Bioluminescence in water and land organisms

• Cellular respiration in animals

Which of the following is an example of a coenzyme?

• Zinc

• Iron

• Vitamins

• Copper

What is the optimal temperature range for most human enzymes?

• 25–30°C

• 35–40°C

• 45–50°C

• 60–70°C

Which enzyme is responsible for breaking down sucrose?

• Amylase

• Sucrase

• Lipase

• Protease

Where does a substrate bind to an enzyme?

• Coenzyme

• Active site

• Allosteric site

• Outer membrane

Why is it important for cells to regulate their metabolic pathways?

• To prevent energy production

• To ensure chemical reactions occur randomly

• To prevent chemical chaos and conserve resources

• To allow uncontrolled enzyme activity

How do cells regulate enzyme activity?

• By switching genes on or off

• By removing enzymes from the cell

• By stopping all metabolic pathways

• By increasing the temperature of the cell

Which of the following acts as an allosteric activator in metabolism?

• ATP

• ADP

• Water

• Carbon dioxide

What is the primary function of catabolic pathways?

• To build complex molecules from simpler ones

• To release energy by breaking down complex molecules

• To store energy in the form of ATP without any breakdown

• To transport molecules across the membrane without energy use