What Do You Know About Glycolysis Metabolic Pathway? Trivia Quiz

2.

NAD+ is a , its reduced form is ___.

Electron carrier, NADPH
Electron carrier, NADH
Reducing agent, NAD
Transport protein, NADH

Correct Answer

A. Electron carrier, NADH

Explanation

NAD+ is a molecule that functions as an electron carrier in cellular respiration. It accepts electrons from other molecules and becomes reduced to NADH. NADH can then donate these electrons to the electron transport chain, where they are used to generate ATP. Therefore, NAD+ is correctly identified as an electron carrier, and its reduced form is correctly identified as NADH.

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3.

What is the role of oxygen in cellular respiration?

It is reduced in glycolysis as glucose is oxidized
It provides electrons to the ETC
It provides the activation energy needed for oxidation to occur
It is the final electron acceptor for the ETC
It combines with the carbon removed during the citric acid cycle to form carbon dioxide

Correct Answer

A. It is the final electron acceptor for the ETC

Explanation

Oxygen serves as the final electron acceptor for the electron transport chain (ETC) in cellular respiration. During the ETC, electrons are passed along a series of proteins, and oxygen accepts these electrons at the end of the chain, forming water. This process is crucial for the production of ATP, the energy currency of the cell. Without oxygen as the final electron acceptor, the ETC would not be able to function properly, leading to a decrease in ATP production and potentially disrupting cellular respiration.

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4.

How many molecules of carbon dioxide are generated for each molecule of acetyl CoA introduced into the citric acid cycle?

1
2
3
4

Correct Answer

A. 2

Explanation

For each molecule of acetyl CoA introduced into the citric acid cycle, two molecules of carbon dioxide are generated. This is because during the citric acid cycle, the acetyl CoA is oxidized and broken down, resulting in the release of two molecules of carbon dioxide as a byproduct. Therefore, the correct answer is 2.

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5.

Which of the following reactions is incorrectly paired with its location?

ATP synthysis-inner membrane of the mitochondrion, matrix, and cytosol
Fermentation - cell cytosol
Glycolysis - cell cytosol
Substrate level phosphorylation - cytosol & matrix
Citric acid cycle - cristae of mitochondrion

Correct Answer

A. Citric acid cycle - cristae of mitochondrion

Explanation

The citric acid cycle, also known as the Krebs cycle, takes place in the matrix of the mitochondrion, not in the cristae. The cristae of the mitochondrion are involved in the electron transport chain, which is a separate process that occurs after the citric acid cycle. Therefore, the pairing of the citric acid cycle with the cristae of the mitochondrion is incorrect.

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6.

Why is glycolysis considered one of the first metabolic pathways to have evolved?

It relies on fermentation, which is characteristic of archaea & bacteria
It is found only in prokaryotes, whereas eukaryotes use their mitochondria to produce ATP
It produces much less ATP than does the electron transport chain & chemiosmosis
It relies totally on enzymes that are produced by free ribosomes, and bacteria have only free ribosomes and no bound ribosomes
It is nearly universal, is located in the cytosol, and does not involve oxygen

Correct Answer

A. It is nearly universal, is located in the cytosol, and does not involve oxygen

Explanation

Glycolysis is considered one of the first metabolic pathways to have evolved primarily because it is nearly universal, occurring in virtually all living organisms, and it does not require oxygen. These characteristics suggest that glycolysis likely evolved in an ancient, oxygen-lacking environment, possibly before the atmosphere contained significant amounts of oxygen. Additionally, glycolysis occurs in the cytosol, the fluid component of the cell, making it accessible to simple cells without specialized organelles like mitochondria. This universality and simplicity make glycolysis a fundamental and ancient metabolic pathway.

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7.

Cyanide is a poison that blocks the passage of electrons along the ETC. Which of the following is a metabolic effect of this poison?

No proton gradient would be produced, and ATP synthesis would cease
NADH supplies would be exhausted, and ATP synthesis would cease
Alcohol would build up in the cells
Electrons are passed directly to oxygen, causing cells to explode
The pH of the intermembrane space becomes much lower than normal

Correct Answer

A. No proton gradient would be produced, and ATP synthesis would cease

Explanation

Cyanide is a poison that blocks the passage of electrons along the Electron Transport Chain (ETC). The ETC is responsible for creating a proton gradient across the inner mitochondrial membrane, which is necessary for ATP synthesis. Therefore, if cyanide blocks the ETC, no proton gradient would be produced, leading to the cessation of ATP synthesis. This explains why no proton gradient would be produced, and ATP synthesis would cease as a metabolic effect of cyanide poisoning.

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2

8.

What are the inputs and ouputs of the citric acid cycle?

Inputs: glucose, oxygen; outputs: carbon dioxide, ATP
Inputs: acetyl CoA, NAD, FAD, ADP; outputs: carbon dioxide, NADH, FADH2, ATP
Inputs: glucose, ATP, NAD, ADP; outputs: pyruvate, ATP, NADH, water
Inputs: pyruvate, NAD, FAD, ADP; outputs: carbon dioxide, NADH, FADH2, ATP

Correct Answer

A. Inputs: acetyl CoA, NAD, FAD, ADP; outputs: carbon dioxide, NADH, FADH2, ATP

Explanation

The citric acid cycle, also known as the Krebs cycle, is a series of chemical reactions that occur in the mitochondria of cells. It is an important part of cellular respiration and plays a key role in the production of ATP, the main energy currency of cells.

The correct answer states that the inputs of the citric acid cycle are acetyl CoA, NAD, FAD, and ADP. Acetyl CoA is derived from the breakdown of glucose or other molecules, while NAD and FAD are coenzymes that carry electrons. ADP is a precursor molecule that is used to produce ATP.

The outputs of the citric acid cycle are carbon dioxide, NADH, FADH2, and ATP. Carbon dioxide is a waste product that is released into the bloodstream and eventually exhaled. NADH and FADH2 are high-energy molecules that carry electrons to the electron transport chain, where they are used to generate more ATP. Finally, ATP is the end product of the citric acid cycle and is used by cells as a source of energy.

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9.

Account for the net production of ATP at each step of cell respiration for one molecule of glucose.

Glycolysis=2, citric acid cycle=2, oxidative phosphorylation=32
Glycolysis=4, citric acid cycle=2, oxidative phosphorylation=32
Glycolysis=2, citric acid cycle=1, oxidative phosphorylation=32
Glycolysis=2, citric acid cycle=2, oxidative phosphorylation=36

Correct Answer

A. Glycolysis=2, citric acid cycle=2, oxidative phosphorylation=32

10.

In addition to 2 net ATP and carbon dioxide, infermentation either or are produced.

Pyruvate or alcohol
Acetyl CoA or lactic acid
Lactic acid or alcohol
Pyruvate or NADH

Correct Answer

A. Lactic acid or alcohol

Explanation

In fermentation, pyruvate is converted into either lactic acid or alcohol. This process occurs in the absence of oxygen and is an alternative pathway for energy production. Lactic acid fermentation occurs in certain bacteria and muscle cells, while alcohol fermentation is common in yeast and some bacteria. Both pathways regenerate NAD+ from NADH, allowing glycolysis to continue producing ATP. Therefore, the correct answer is lactic acid or alcohol.

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What Do You Know About Glycolysis Metabolic Pathway? Trivia Quiz

In the conversion of glucose and oxygen to carbon dioxide and water, which molecule is oxidized?

Quiz Preview

NAD+ is a , its reduced form is ___.

What is the role of oxygen in cellular respiration?

How many molecules of carbon dioxide are generated for each molecule of acetyl CoA introduced into the citric acid cycle?

Which of the following reactions is incorrectly paired with its location?

Why is glycolysis considered one of the first metabolic pathways to have evolved?

Cyanide is a poison that blocks the passage of electrons along the ETC. Which of the following is a metabolic effect of this poison?

What are the inputs and ouputs of the citric acid cycle?

Account for the net production of ATP at each step of cell respiration for one molecule of glucose.

In addition to 2 net ATP and carbon dioxide, infermentation either or are produced.

What Do You Know About Glycolysis Metabolic Pathway? Trivia Quiz

In the conversion of glucose and oxygen to carbon dioxide and water, which molecule is oxidized?

Quiz Preview

NAD+ is a __________, its reduced form is _____________.

What is the role of oxygen in cellular respiration?

How many molecules of carbon dioxide are generated for each molecule of acetyl CoA introduced into the citric acid cycle?

Which of the following reactions is incorrectly paired with its location?

Why is glycolysis considered one of the first metabolic pathways to have evolved?

Cyanide is a poison that blocks the passage of electrons along the ETC. Which of the following is a metabolic effect of this poison?

What are the inputs and ouputs of the citric acid cycle?

Account for the net production of ATP at each step of cell respiration for one molecule of glucose.

In addition to 2 net ATP and carbon dioxide, infermentation either ______ or ______ are produced.

NAD+ is a , its reduced form is ___.

In addition to 2 net ATP and carbon dioxide, infermentation either or are produced.