Cellular Respiration QUIZ

During exercise, the human body uses aerobic cellular respiration to produce energy. Which of the following reactants does aerobic respiration rely on?

• Oxygen and glucose.

• Glucose and lactic acid.

• Oxygen and nitrogen.

• Water and carbon dioxide.

Answer explanation

Aerobic respiration requires oxygen and glucose to produce energy. Oxygen is essential for the process, while glucose serves as the primary fuel source, making 'Oxygen and glucose' the correct choice.

Tags

NGSS.HS-LS2-3

NGSS.HS-LS1-7

__________ is the FIRST STEP in cellular respiration that begins releasing energy stored in glucose

• Lactic acid fermentation

• Glycolysis

• Electron transport chain

• Photosynthesis

Answer explanation

Glycolysis is the first step in cellular respiration, where glucose is broken down into pyruvate, releasing energy. This process occurs in the cytoplasm and is essential for further energy extraction in later stages.

Since fermentation DOES NOT require oxygen, it is said to be ____________

• Aerobic

• Anaerobic

• ATP

• Photosynthesis

Answer explanation

Fermentation occurs in the absence of oxygen, making it an anaerobic process. Therefore, the correct answer is 'Anaerobic', as it specifically refers to processes that do not require oxygen.

Tags

NGSS.HS-LS2-3

Which stage of cellular respiration produces the MOST ATP?

• Glycolysis

• Krebs cycle

• Electron transport chain

• Photosynthesis

Answer explanation

The electron transport chain produces the most ATP during cellular respiration, generating approximately 28-34 ATP molecules through oxidative phosphorylation, significantly more than glycolysis or the Krebs cycle.

Tags

NGSS.HS-LS2-3

NGSS.HS-LS1-7

Which of the following shows the CORRECT sequence for cellular respiration?

• Electron transport chain ---> glycolysis ---> krebs cycle

• krebs cycle ---> Electron transport chain ---> glycolysis

• Glycolysis ---> Electron transport chain ---> krebs cycle

• Glycolysis ---> krebs cycle ---> Electron transport chain

Answer explanation

The correct sequence for cellular respiration is Glycolysis, followed by the Krebs cycle, and finally the Electron transport chain. This order reflects the pathway of glucose breakdown and energy production.

Tags

NGSS.HS-LS1-7

Which statement about cellular respiration during exercise is true?

• Cellular respiration requires only glucose, and no oxygen is used.

• Cellular respiration in muscles switches to anaerobic respiration when oxygen levels are low.

• Cellular respiration occurs faster without oxygen.

• Cellular respiration occurs slower when oxygen is abundant.

Answer explanation

Cellular respiration in muscles switches to anaerobic respiration when oxygen levels are low, allowing for energy production even when oxygen is scarce, which is crucial during intense exercise.

Tags

NGSS.HS-LS2-3

NGSS.HS-LS1-7

Which of the following processes helps the human body meet the increased demand for oxygen during physical activity?

• The heart pumps blood more slowly to conserve oxygen.

• The blood vessels constrict to redirect blood away from muscles.

• The heart beats faster, and blood flow increases to muscles.

• The body stores excess oxygen in the muscles for later use.

Answer explanation

During physical activity, the heart beats faster and increases blood flow to the muscles, delivering more oxygen to meet the heightened demand. This process is essential for sustaining energy and performance.

Tags

NGSS.HS-LS1-3

Which of the following equations represents AEROBIC cellular respiration?

• C6H12O6 ------> 2 pyruvate + 2 ATP

• 6 CO2 + 6 H2O + energy ------> C6H12O6 + 6 O2

• C6H12O6 + 6 O2 ------> 6 CO2 + 6 H2O + energy

• C6H12O6 ------> 2 lactate + 2 ATP

Answer explanation

The correct equation for aerobic cellular respiration is C6H12O6 + 6 O2 ------> 6 CO2 + 6 H2O + energy, as it shows glucose reacting with oxygen to produce carbon dioxide, water, and energy, which is characteristic of aerobic processes.

Tags

NGSS.HS-LS2-3

NGSS.HS-LS1-7

Which of the following pathways and reactions will result in the production of the MOST ATP molecules during aerobic cellular respiration of one glucose molecule?

• Glycolysis

• Krebs cycle

• Electron transport system

• Fermentation

Answer explanation

The electron transport system produces the most ATP during aerobic respiration, generating approximately 28-34 ATP molecules from one glucose molecule, while glycolysis and the Krebs cycle produce significantly less.

Tags

NGSS.HS-LS2-3

NGSS.HS-LS1-7

When oxygen is NOT available to an animal cell, which of the following statement is correct?

• Only the electron transport system remains operative.

• The cells production of ATP molecules is doubled.

• Cells uses carbon dioxide to begin cellular respiration

• Glycolysis still occurs during fermentation

Answer explanation

In the absence of oxygen, animal cells undergo fermentation, where glycolysis still occurs to produce ATP. This process allows cells to generate energy without relying on the electron transport chain.

Tags

NGSS.HS-LS2-3