PICK ME QUEST

A

1

What is the main purpose of cellular respiration?
a. To produce oxygen
b. To break down food and release energy
c. To create new cells
d. To absorb sunlight

b. To break down food and release energy ✅

_{Explanation:
 Cellular respiration’s main goal is to break down glucose (food) to release energy in the form of ATP, which cells use for various functions.} 

2

Which organelle is known as the “powerhouse of the cell”?
a. Nucleus
b. Ribosome
c. Mitochondrion
d. Golgi apparatus

c. Mitochondria ✅

_{Explanation:
 The mitochondrion is called the powerhouse because it is where most ATP (energy) is produced during cellular respiration.}

3

What is the main energy-carrying molecule produced during cellular respiration?
a. DNA
b. ATP
c. RNA
d. ADP

b. ATP ✅

_{Explanation:
ATP (adenosine triphosphate) stores and provides energy for cell activities such as movement, growth, and repair.}

4

Which of the following substances is needed for aerobic respiration to occur?
a. Carbon dioxide
b. Oxygen
c. Nitrogen
d. Hydrogen

b. Oxygen ✅

_{Explanation:
Aerobic respiration requires oxygen to break down glucose completely and produce more ATP.}

5

What are the products of cellular respiration?
a. Glucose and oxygen
b. Carbon dioxide, water, and energy (ATP)
c. Oxygen and water
d. Glucose and carbon dioxide

b. Carbon dioxide, water, and energy (ATP) ✅

_{Explanation:
When glucose reacts with oxygen, it produces carbon dioxide, water, and energy (ATP) — the usable form of energy for the cell.}

B

1

Where does glycolysis occur in the cell?
a. Nucleus
b. Cytoplasm
c. Mitochondria
d. Ribosomes

b. Cytoplasm ✅

_{Explanation:
Glycolysis, the first step of cellular respiration, happens in the cytoplasm and breaks down glucose into pyruvate.}

2

How many ATP molecules are produced in total during cellular respiration (aerobic)?
a. 2
b. 4
c. 36–38
d. 100

c. 36–38 ✅

_{Explanation:
Complete aerobic respiration produces about 36 to 38 ATP molecules from one molecule of glucose.}

3

Which stage of cellular respiration does not require oxygen?
a. Glycolysis
b. Krebs cycle
c. Electron transport chain
d. All of the above

a. Glycolysis ✅

_{Explanation:
Glycolysis does not need oxygen—it can occur under both aerobic and anaerobic conditions.}

4

What is the starting molecule for glycolysis?
a. Oxygen
b. Glucose
c. ATP
d. Carbon dioxide

b. Glucose ✅

_{Explanation:
Glycolysis starts with one molecule of glucose, which is broken down into two molecules of pyruvate.}

5

In which part of the mitochondrion does the Krebs cycle occur?
a. Outer membrane
b. Inner membrane
c. Matrix
d. Cytoplasm

c. Matrix ✅

_{Explanation:
The Krebs cycle takes place in the mitochondrial matrix, where pyruvate is further broken down to release electrons and CO₂.}

C

1

What happens to the energy released from glucose during respiration?
a. It is lost as heat only
b. It is stored in ATP molecules
c. It becomes oxygen
d. It disappears

b. It is stored in ATP molecules ✅

_{Explanation:
The energy from glucose is captured and stored in ATP molecules, which power cellular activities.}

2

What type of respiration occurs when oxygen is not available?
a. Aerobic respiration
b. Photosynthesis
c. Anaerobic respiration
d. Transpiration

c. Anaerobic respiration ✅

_{Explanation:
Anaerobic respiration (or fermentation) happens without oxygen and produces less ATP compared to aerobic respiration.}

3

In muscle cells, what is produced during anaerobic respiration?
a. Alcohol
b. Water
c. Glucose
d. Lactic acid

d. Lactic acid ✅

_{Explanation:
When muscles lack oxygen during intense activity, they produce lactic acid, causing muscle fatigue.}

4

What are the reactants of cellular respiration?
a. Carbon dioxide and water
b. Glucose and oxygen
c. ATP and carbon dioxide
d. Water and nitrogen

b. Glucose and oxygen ✅

_{Explanation:
The process of respiration starts with glucose (food) and oxygen to produce energy, carbon dioxide, and water.}

5

Which of the following best describes the overall chemical equation for cellular respiration?
a. Glucose + Oxygen → Carbon dioxide + Water + Energy
b. Water + Carbon dioxide → Glucose + Oxygen
c. Oxygen + ATP → Water + Glucose
d. Carbon dioxide + Water → Energy + Glucose

a. Glucose + Oxygen → Carbon dioxide + Water + Energy ✅ 

_{Explanation:
This is the correct equation for cellular respiration, where glucose and oxygen produce carbon dioxide, water, and ATP (energy).}