(Grade 9 - Makabayan) Respiration

All organisms get energy from food to perform different life processes. This is done in the cells by breaking down sugar molecules into chemical energy. Which of the following cell organelles is associated with the production of chemical energy?

• 
• 
• 

Which of the following is TRUE about glycolysis?

• Glucose is broken down into two molecules of a 3-carbon molecule called pyruvate.

• Pyruvate is broken down into two molecules of a 3-carbon molecule called glucose.

• Pyruvate is transported into mitochondria.

The stage of cellular respiration allows the release of a large amount of chemical energy.

• Glycolysis

• Electron transport System

• Krebs cycle

How does organism get the energy they need?

• By breaking down food molecules gradually and capturing their chemical energy.

• By breathing oxygen into the lungs and combining it with CO₂

• By burning food molecules and releasing energy as heat

Which of the following is NOT a product of cellular respiration?

• CO₂

• ATP

• O₂

Which of the following is the correct sequence of the stages of Aerobic cellular respiration?

• Krebs cycle - electron transport system - glycolysis

• glycolysis - electron transport system - Krebs cycle

• glycolysis - Krebs cycle -electron transport system

Why is ATP very important?

• It is the energy currency of the cell

• It breaks down the food that we eat

• It contains DNA that contain information

When cells breakdown a sugar molecule completely to produce chemical energy (ATP), the cells need __________

• sugar and oxygen

• sugar only

• sugar and water

Oxygen is essential in cellular respiration. What is the role of oxygen in the electron transport chain?

• It provides a high energy proton

• It releases an electron

• It serves as the final acceptor

The Krebs cycle does NOT occur if __________

• oxygen is present

• glycolysis occurs

• oxygen is not present