Cellular Respiration Quiz

The molecules in the food we eat contain chemical energy stored in chemical bonds. Which statement BEST explains how this energy is released?

• Cells burn food molecules, releasing energy as heat that powers movement while keeping the body at the correct temperature.
• Cells extract and capture the energy in food molecules all at once, then store it for later use.
• Chemical bonds in food molecules are broken, releasing energy and allowing cells to use the energy to make ATP.
• Chemical energy is released as eaten food is digested, giving off heat as a by-product.

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Natasha is making a model of cellular respiration. Her model shows the pathway followed when there is enough oxygen available. What does Natasha’s model show?

• an aerobic pathway consisting of glycolysis and fermentation
• an aerobic pathway consisting of glycolysis, the Krebs cycle, and the electron transport chain
• an anaerobic pathway consisting of glycolysis and fermentation
• an anaerobic pathway consisting of glycolysis, the Krebs cycle, and the electron transport chain

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Savannah is asked to explain the locations of the stages of cellular respiration. What location should she give for the site of the Krebs cycle reactions?

• the nucleus, the innermost part of the cell
• the matrix of the mitochondria
• the cell membrane, which surrounds the cell
• the cytoplasm of the cell

Celeste and Raymond are studying the differences between prokaryotes and eukaryotes. They learn that in eukaryotic cells the electron transport chain is in a different location than in prokaryotic cells. Which statement give the correct explanation of this difference?

• In eukaryotes, the electron transport chain is composed of a series of electron carriers located in the cell membrane.
• In eukaryotes, the electron transport chain is composed of a series of electron carriers located in the Golgi apparatus.
• In prokaryotes, there is no mitochondria and glycolysis is the main reaction which take place in the cytoplasm.
• In prokaryotes, the electron transport chain is in the nucleus.

The Krebs cycle consists of many small steps, each catalyzed by an enzyme. What is another name for the Krebs cycle?

• the carbon dioxide cycle
• the citric acid cycle
• the Calvin cycle
• the pyruvic acid cycle

Jose and Rema are making sourdough bread. They have been feeding the starter dough for a week now, and it has undergone lactic acid fermentation. They mix the dough and add a portion of the starter, which will give the bread its famous texture and sour flavor.

• Alcoholic fermentation takes place, and the yeast give off oxygen, creating pockets in the dough.
• Alcoholic fermentation takes place, and the H2O byproduct of the electron transport chain vaporizes to create pockets in the dough.
• Alcoholic fermentation takes place and ethyl alcohol and CO2 gas are formed, creating pockets in the dough.
• Alcoholic fermentation takes place, and during the Krebs cycle, CO2 is produced, creating pockets in the dough.

Xavier and Jill are practicing the 100-meter sprint. Which statement BEST describes the metabolic pathways their muscles will utilize to produce the quick energy needed for this intense anaerobic exercise?

• Glycolysis begins glucose metabolism, and in the absence of oxygen, lactic acid fermentation takes over.
• Glycolysis produces pyruvic acid and 2 molecules of ATP, then in the absence of oxygen, alcoholic fermentation regenerates NAD+ to keep glycolysis running.
• Glucose is converted to pyruvic acid, followed by the aerobic pathways of the Krebs cycle and the electron transport chain.
• The pyruvic acid from glycolysis enters the mitochondria and is broken down  in the Krebs cycle.

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Milo is analyzing the steps of cellular respiration. His goal is to quantify the amount of useful chemical energy that cellular respiration can generate from one molecule of glucose. Which of these chemical changes that occur during cellular respiration would be MOST USEFUL for Milo to track and identify?

• the conversion of glucose to pyruvic acid
• the addition of hydrogen to oxygen, forming water
• the conversion of ADP to ATP
• the removal of carbon dioxide from the Krebs Cycle

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What is the role of oxygen gas (O2) in glycolysis?

• Oxygen is an intermediate of glycolysis.
• oxygen has no direct role in glycolysis.
• Oxygen is a reactant of glycolysis.
• Oxygen is a product of glycolysis.

In the human body, muscle cells complete aerobic respiration in the presence of oxygen. Are muscle cells able to function without oxygen?

• No. Muscle cells are unable to gain energy from glucose when oxygen is absent.
• Yes. For a brief time, they can perform fermentation without oxygen.
• No. Muscle cells are unable to receive glucose when oxygen is absent.
• Yes. For a brief time, they can complete aerobic respiration without oxygen.

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