Cellular Respiration Quiz: Test
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Do you think you understand well about cellular respiration? Cellular respiration occurs in both eukaryotic and prokaryotic cells, with most reactions taking place in prokaryotes' cytoplasm and the mitochondria of eukaryotes. Cellular respiration involves catabolic reactions in which large molecules are broken down into smaller molecules, and they release energy in the process. You can take a deep breath; this informative quiz will explain cellular respiration to you, and good luck with it.
- 1.
The aerobic and anaerobic pathways of cellular respiration REQUIRE which products?
- A.
ATP, pyruvic acid (pyruvate), and NADH
- B.
Pyruvic acid (pyruvate) and NADH
- C.
Pyruvic acid (pyruvate) and ATP
- D.
NADH and ATP
Correct Answer
B. Pyruvic acid (pyruvate) and NADHExplanation
The aerobic and anaerobic pathways of cellular respiration require pyruvic acid (pyruvate) and NADH. Pyruvic acid is the end product of glycolysis, which is the first step in both aerobic and anaerobic respiration. NADH is an important electron carrier that is produced during glycolysis and the Krebs cycle. These two molecules are necessary for the subsequent steps of cellular respiration, including the Krebs cycle and oxidative phosphorylation, where ATP is generated. ATP is not required for these pathways, but it is produced as a result of the energy released during cellular respiration.Rate this question:
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- 2.
During alcoholic fermentation,
- A.
Glucose is split into 3 pyruvic acid (pyruvate)
- B.
3 ATP molecules are produced
- C.
NAD+ is regenerated, allowing glycolysis to continue
- D.
Oxygen in required
Correct Answer
C. NAD+ is regenerated, allowing glycolysis to continueExplanation
During alcoholic fermentation, glucose is split into 3 pyruvic acid (pyruvate). This process generates 3 ATP molecules. However, since alcoholic fermentation occurs in the absence of oxygen, the electron carrier molecule NAD+ is regenerated to allow glycolysis to continue. NAD+ is necessary for the conversion of glucose to pyruvate in glycolysis, and without its regeneration, glycolysis would not be able to proceed, leading to a halt in energy production.Rate this question:
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- 3.
Which of the following are anaerobic and occur in the cytoplasm of the cell?
- A.
Fermentation only
- B.
Fermentation and glycolysis
- C.
Glycolysis, Krebs cycle, and ETC
- D.
Krebs cycle and ETC
Correct Answer
B. Fermentation and glycolysisExplanation
Fermentation and glycolysis are both anaerobic processes that occur in the cytoplasm of the cell. During fermentation, glucose is broken down into simpler molecules without the use of oxygen, producing a small amount of ATP. Glycolysis is the first step in cellular respiration, where glucose is converted into pyruvate, also without the use of oxygen, and a small amount of ATP is produced. Therefore, the correct answer is fermentation and glycolysis.Rate this question:
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- 4.
The Krebs cycle stars with
- A.
Pyruvic acid (pyruvate) and yields lactic acid or alcohol
- B.
Glucose and yields 32 ATPs
- C.
Lactic acid and yield carbon dioxide
- D.
Pyruvic acid (pyruvate) and yields carbon dioxide
Correct Answer
D. Pyruvic acid (pyruvate) and yields carbon dioxideExplanation
The Krebs cycle starts with pyruvic acid (pyruvate) and yields carbon dioxide. This is because pyruvate is converted into acetyl-CoA, which enters the Krebs cycle. During the cycle, acetyl-CoA is further broken down and carbon dioxide is released as a byproduct. This process produces energy in the form of ATP and also generates NADH and FADH2, which are used in the electron transport chain to produce more ATP.Rate this question:
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- 5.
Lactic acid fermentation occurs in
- A.
Aerobic conditions
- B.
Mitochondria
- C.
Yeast
- D.
Muscle cells
Correct Answer
D. Muscle cellsExplanation
Lactic acid fermentation occurs in muscle cells. During intense exercise, when there is not enough oxygen available, muscle cells switch to anaerobic respiration to produce energy. This process involves the breakdown of glucose to lactic acid, which causes muscle fatigue and soreness. Therefore, lactic acid fermentation is a characteristic process that occurs in muscle cells during strenuous physical activity.Rate this question:
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- 6.
How are cellular respiration and photosynthesis almost opposite processes?
- A.
Photosynthesis releases energy, and cellular respiration stores energy.
- B.
Photosynthesis removes carbon dioxide from the atmosphere, and cellular respiration puts it back.
- C.
Photosynthesis removes oxygen from the atmosphere, and cellular respiration puts it back.
- D.
All of the above
Correct Answer
B. pHotosynthesis removes carbon dioxide from the atmospHere, and cellular respiration puts it back.Explanation
Photosynthesis and cellular respiration are almost opposite processes because they have opposite effects on carbon dioxide levels in the atmosphere. During photosynthesis, plants take in carbon dioxide from the atmosphere and convert it into glucose, releasing oxygen as a byproduct. This process helps to reduce the amount of carbon dioxide in the atmosphere. On the other hand, during cellular respiration, organisms break down glucose and release carbon dioxide as a waste product, thereby putting it back into the atmosphere. Therefore, photosynthesis removes carbon dioxide from the atmosphere, while cellular respiration puts it back.Rate this question:
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- 7.
The energy of the electrons passing along the electron transport chain is used to make
- A.
Citric acid
- B.
Alcohol
- C.
Lactic acid
- D.
ATP
Correct Answer
D. ATPExplanation
The energy of the electrons passing along the electron transport chain is used to make ATP. ATP (adenosine triphosphate) is the primary energy currency of cells. It is produced during cellular respiration through a process called oxidative phosphorylation, which occurs in the inner mitochondrial membrane. As electrons are transferred along the electron transport chain, their energy is used to pump protons across the membrane, creating a proton gradient. This gradient is then used by ATP synthase to produce ATP from ADP and inorganic phosphate. Therefore, ATP is the correct answer as it is the main product of the electron transport chain.Rate this question:
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- 8.
Which process generates MOST of the ATP produced during cellular respiration?
- A.
ETC
- B.
Glycolysis
- C.
Fermentation
- D.
Krebs cycle
Correct Answer
A. ETCExplanation
The electron transport chain (ETC) generates the most ATP during cellular respiration. This process occurs in the inner mitochondrial membrane and involves the transfer of electrons from electron carriers to generate a proton gradient. The protons then flow back through ATP synthase, driving the synthesis of ATP. The ETC is the final step in cellular respiration and produces the majority of the ATP molecules through oxidative phosphorylation. Glycolysis and the Krebs cycle also produce ATP, but they generate fewer molecules compared to the ETC. Fermentation does not produce ATP through oxidative phosphorylation and is therefore not the main source of ATP production.Rate this question:
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- 9.
Which of the following passes high-energy electrons into the electron transport chain?
- A.
Acetyl-CoA
- B.
NADH and FADH2
- C.
Citric acid
- D.
ATP and ADP
Correct Answer
B. NADH and FADH2Explanation
NADH and FADH2 are molecules that carry high-energy electrons to the electron transport chain. These molecules are produced during the Krebs cycle (also known as the citric acid cycle) when acetyl-CoA is oxidized. ATP and ADP are not directly involved in passing high-energy electrons into the electron transport chain.Rate this question:
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- 10.
C6 H12O6 + 6O2 + ADP + P -----> 6CO2 + 6 H2O + ATP The process shown in the equation above begins in the cytoplasm of a cell and ends in the
- A.
Chloroplast
- B.
Cytoplasm
- C.
Mitochondria
- D.
All of the above
Correct Answer
C. MitochondriaExplanation
The process shown in the equation above is cellular respiration, which is the process by which cells convert glucose and oxygen into carbon dioxide, water, and ATP (energy). Cellular respiration occurs in the mitochondria of a cell, where the majority of ATP production takes place. The equation represents the overall reaction of cellular respiration, which starts in the cytoplasm with the breakdown of glucose and ends in the mitochondria with the production of ATP. Therefore, the correct answer is mitochondria.Rate this question:
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- 11.
Unlike photosynthesis, cellular respiration occurs in
- A.
Animal cells only
- B.
Plant cells only
- C.
All but plant cells
- D.
All eukaryotic cells
Correct Answer
D. All eukaryotic cellsExplanation
Cellular respiration is the process by which cells break down glucose and convert it into energy. Unlike photosynthesis, which only occurs in plant cells, cellular respiration occurs in all eukaryotic cells. Eukaryotic cells are a type of cell that have a nucleus and other membrane-bound organelles. This means that cellular respiration can occur in both animal and plant cells, as well as in other eukaryotic organisms. Therefore, the correct answer is "all eukaryotic cells".Rate this question:
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- 12.
At the end of the electron transport chain,
- A.
The electrons combine with oxygen and protons to form water.
- B.
The electrons build up inside the mitochondria and diffuse back to thylakoid.
- C.
The electrons are used in the formation of ethyl alcohol.
- D.
None of the above
Correct Answer
A. The electrons combine with oxygen and protons to form water.Explanation
At the end of the electron transport chain, the electrons combine with oxygen and protons to form water. This is known as the final step of aerobic respiration, where oxygen acts as the final electron acceptor. The electrons are transferred from one molecule to another along the electron transport chain until they reach oxygen. The combination of electrons, oxygen, and protons produces water as a byproduct. This process is crucial for generating ATP, the energy currency of the cell, and is a fundamental step in cellular respiration.Rate this question:
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- 13.
Which of the following is the correct sequence of events in AEROBIC cellular respiration?
- A.
Krebs cycle > electron transport chain > glycolysis
- B.
Krebs cycle > glycolysis > electron transport chain
- C.
Glycolysis > Krebs cycle > electron transport chain
- D.
Glycolysis > fermentation > Krebs cycle
Correct Answer
C. Glycolysis > Krebs cycle > electron transport chainExplanation
The correct sequence of events in aerobic cellular respiration is glycolysis, followed by the Krebs cycle, and then the electron transport chain. Glycolysis is the initial step in which glucose is broken down into pyruvate. The pyruvate then enters the Krebs cycle, where it undergoes further reactions to produce energy-rich molecules. Finally, these energy-rich molecules are used in the electron transport chain to generate ATP, the main energy currency of the cell. Therefore, the correct answer is glycolysis > Krebs cycle > electron transport chain.Rate this question:
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- 14.
Which of the following is NOT true about the amount of ATP produced during aerobic cellular respiration?
- A.
A net gain of 2 ATP molecules is produced during glycolysis.
- B.
4 ATP molecules are produced during the Krebs cycle.
- C.
32 ATP molecules are produced during the electron transport chain
- D.
36 ATP molecules are produced overall.
Correct Answer
B. 4 ATP molecules are produced during the Krebs cycle.Explanation
During aerobic cellular respiration, a net gain of 2 ATP molecules is indeed produced during glycolysis. However, the Krebs cycle produces a total of 2 ATP molecules, not 4. The correct answer is that 4 ATP molecules are not produced during the Krebs cycle.Rate this question:
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- 15.
The Krebs cycle takes place in which of the following areas?
- A.
2 only (outer membrane)
- B.
3 only (intermembrane space)
- C.
4 only (matrix)
- D.
1 only (inner membrane)
- E.
1,3, and 4
Correct Answer
C. 4 only (matrix)Explanation
The Krebs cycle, also known as the citric acid cycle, is a series of chemical reactions that occur in the matrix of the mitochondria. The matrix is the innermost compartment of the mitochondria, surrounded by the inner membrane. Therefore, the correct answer is 4 only (matrix).Rate this question:
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- 16.
Which of the following is TRUE about glycolysis?
- A.
Glycolysis is aerobic
- B.
Glycolysis produces a net gain of 4 ATP.
- C.
Glucose is broken down into pyruvic acid (pyruvate).
- D.
Glucose is completely broken down into carbon dioxide.
Correct Answer
C. Glucose is broken down into pyruvic acid (pyruvate).Explanation
Glycolysis is the process by which glucose is broken down into pyruvic acid (pyruvate) in the cytoplasm of cells. This process occurs in both aerobic and anaerobic conditions. In aerobic conditions, pyruvate is further metabolized in the mitochondria to produce more ATP through the Krebs cycle and oxidative phosphorylation. However, glycolysis itself does not require oxygen and can occur in the absence of oxygen. Therefore, the statement "Glucose is broken down into pyruvic acid (pyruvate)" is true.Rate this question:
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- 17.
Pathway A Glucose--> Pyruvic acid --> Lactic acid (2 ATP produced) Pathway B Glucose--> Pyruvic acid --> Carbon dioxide + Ethanol (2 ATP produced) Pathway C Glucose--> Pyruvic acid --> Carbon dioxide + water (36 ATP produced) Which of the following is true about the above pathways?
- A.
The Krebs cycle occurs after pathway A
- B.
Pathway C occurs in the presence of oxygen
- C.
Both pathways A and B occur in the presence of oxygen
- D.
Both answers A and C
Correct Answer
B. Pathway C occurs in the presence of oxygenExplanation
Pathway C, which produces 36 ATP, is known as aerobic respiration and occurs in the presence of oxygen. This is because the final step of aerobic respiration involves the Krebs cycle, which produces carbon dioxide and water. Pathway A, on the other hand, is known as anaerobic respiration and occurs in the absence of oxygen. Pathway B also occurs in the absence of oxygen and is known as alcoholic fermentation, as it produces ethanol. Therefore, the correct answer is that Pathway C occurs in the presence of oxygen.Rate this question:
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- 18.
A science teacher performs an experiment to measure the carbon dioxide uptake of the green algae Chlorella under light conditions. He prepares a suspension of Chlorella and places it in a growth chamber near a lamp. A student disrupts the experiment by turning off the lamp, creating dark conditions. Why is there a negative uptake of carbon dioxide under dark condtions?
- A.
Carbon dioxide production requires light
- B.
Chlorella is actively photosynthesizing
- C.
Cellular respiration is taking place
- D.
Glucose production in the dark requires less carbon dioxide
Correct Answer
C. Cellular respiration is taking placeExplanation
In the absence of light, Chlorella cannot perform photosynthesis and therefore cannot take in carbon dioxide to produce glucose. However, cellular respiration still occurs in the dark, which requires the use of oxygen and produces carbon dioxide as a byproduct. This explains the negative uptake of carbon dioxide under dark conditions.Rate this question:
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- 19.
During aerobic cellular respiration, in which of the following locations do ATP molecules form?
- A.
Mitochondrial matrix and outer mitochondrial membrane only
- B.
Cytosol only
- C.
Cytosol, Mitochondrial matrix and outer mitochondrial membrane only
- D.
Mitochondrial matrix and inner mitochondrial membrane only
Correct Answer
D. Mitochondrial matrix and inner mitochondrial membrane onlyExplanation
ATP molecules are formed during the process of aerobic cellular respiration. This process occurs in the mitochondria of the cell. Specifically, ATP molecules are formed in the mitochondrial matrix and the inner mitochondrial membrane. The mitochondrial matrix is the fluid-filled space inside the mitochondria, while the inner mitochondrial membrane is the membrane that surrounds the matrix. These locations provide the necessary enzymes and proteins for the production of ATP through the electron transport chain and oxidative phosphorylation. Therefore, the correct answer is "Mitochondrial matrix and inner mitochondrial membrane only."Rate this question:
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- 20.
While investigating yeast respiration, a researcher detects ethanol in the yeast culture. Which molecules does the yeast culture also contain?
- A.
Carbon dioxide and ATP
- B.
Lactic acid and ATP
- C.
Oxygen and lactic acid
- D.
Oxygen and Carbon dioxide
Correct Answer
A. Carbon dioxide and ATPExplanation
When yeast undergoes respiration, it produces carbon dioxide and ATP. Carbon dioxide is a byproduct of the breakdown of glucose during the process of cellular respiration. ATP is the energy molecule that is produced during cellular respiration and is used by cells for various metabolic processes. Therefore, the presence of ethanol in the yeast culture suggests that the yeast is undergoing fermentation, producing carbon dioxide and ATP as a result.Rate this question:
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Mar 20, 2023Quiz Edited by
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Apr 23, 2013Quiz Created by
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