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Chapter 7: Problem 44

Where in a cell does glycolysis take place in both prokaryotes and eukaryotes? a. the cytosol b. the mitochondria c. the plasma membrane d. the nucleus

Short Answer

Expert verified
a. the cytosol

Step by step solution

01

Understanding Glycolysis

Glycolysis is a metabolic pathway that converts glucose into pyruvate, releasing energy in the process. It is essential for both prokaryotic and eukaryotic cells.
02

Identify Cellular Locations

Examine the provided choices: cytosol, mitochondria, plasma membrane, and nucleus. These are all parts of a cell where processes can take place.
03

Location in Prokaryotes

In prokaryotes, which lack membrane-bound organelles, glycolysis must occur in a part of the cell shared by all its functions.
04

Location in Eukaryotes

In eukaryotes, analyze where glycolysis might occur by excluding organelles dedicated to specific functions, such as mitochondria (site of the citric acid cycle) and nucleus (site of DNA replication and transcription).
05

Common Location

Both prokaryotes and eukaryotes share the cytosol, the fluid component of the cytoplasm, as the location for many metabolic pathways, including glycolysis.
06

Conclusion

By process of elimination and understanding the functions of each cellular component, it can be determined that glycolysis takes place in the cytosol in both prokaryotic and eukaryotic cells.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

headline of the respective core concept
Glycolysis is a fundamental metabolic pathway that occurs in the cytosol of cells. The cytosol is the fluid part of the cytoplasm, which is the jelly-like substance within the cell membrane. It doesn't include the organelles like the mitochondria or the nucleus, but it plays a critical role in cellular processes. Glycolysis specifically occurs here because the enzymes required for this pathway are present in this part of the cell. As glucose is broken down to pyruvate, energy in the form of ATP is released.

Understanding the cytosol's role is important because it demonstrates how cells manage various metabolic processes in different compartments. Other pathways occur in specialized locations, but glycolysis in the cytosol allows it to be highly efficient and accessible.
headline of the respective core concept
Prokaryotic cells are simpler than eukaryotic cells and lack membrane-bound organelles like mitochondria and a nucleus. Their cellular structure means that all functions occur within a single, undivided space. This includes glycolysis, which, like in eukaryotic cells, happens in the cytosol.

Glycolysis being in the cytosol of prokaryotic cells is significant because these cells depend heavily on this process for energy production. Given their simpler structure, understanding glycolysis in prokaryotes underscores the universality of this pathway and its essential role in cellular metabolism.
headline of the respective core concept
Eukaryotic cells are more complex and have distinct compartments for different processes. Despite this complexity, glycolysis occurs in the cytosol, similar to prokaryotic cells. This location is outside specialized organelles like the mitochondria, where other metabolic processes, such as the citric acid cycle, take place.

The placement of glycolysis in the cytosol within eukaryotic cells illustrates the importance of compartmentalization in more complex organisms. It ensures that glycolysis can occur rapidly to meet the energy needs of the cell without interference from processes in other organelles.
headline of the respective core concept
Metabolic pathways are sets of chemical reactions occurring within a cell. Glycolysis is one of these pathways, converting glucose into pyruvate and generating ATP. This process begins the larger process of cellular respiration.

The cytosol is the location where glycolysis鈥攁 crucial metabolic pathway鈥攈appens. Understanding the role of different metabolic pathways and their specific locations within cells helps us appreciate how cells efficiently produce energy. Each pathway is interconnected, yet distinct in its cellular location to optimize function and maintain cellular health.

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Most popular questions from this chapter

What role does \(\mathrm{NAD}^{+}\) play in redox reactions? a. \(\mathrm{NAD}^{+}\) , an oxidizing agent, can accept electrons and protons from organic molecules and get reduced to NADH. b. \(\mathrm{NAD}^{+}\) , a reducing agent, can donate its electrons and protons to organic molecules. c. \(\mathrm{NAD}^{+}\) , an oxidizing agent, can accept electrons from organic molecules and get reduced to NADH. d. \(\mathrm{NAD}^{+}\) , a reducing agent, can donate its electrons and protons to inorganic molecules.

Nearly all organisms on earth carry out some form of glycolysis. How does this fact support or not support the assertion that glycolysis is one of the oldest metabolic pathways? a. To be present in so many different organisms, glycolysis was probably present in a common ancestor rather than evolving many separate times. b. Glycolysis is present in nearly all organisms because it is an advanced and recently evolved pathway that has been widely used as it is so beneficial. c. Glycolysis is absent in a few higher organisms. This contradicts the fact that it is one of the oldest metabolic pathways. d. Glycolysis is present in some organisms and absent in others. The mentioned fact may or may not support this assertion.

During the second half of glycolysis, what occurs? a. ATP is used up. b. Fructose is split in two. C. ATP is produced. d. Glucose becomes fructose.

Glucose catabolism pathways are sequential and lead to the production of ATP. What is the correct order of the pathways for the breakdown of a molecule of glucose as shown in the formula? \(\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}+\) energy \(\begin{aligned} \text { a. } & \text { oxidative phosphorylation } \rightarrow \text { citric acid cycle } \\ & \rightarrow \text { oxidation of pyruvate } \rightarrow \text { glycolysis } \end{aligned}\) \(\begin{aligned} \text { b. the oxidation of pyruvate } & \rightarrow \text { citric acid cycle } \\ & \rightarrow \text { glycolysis } \rightarrow \text { oxidative phosphorylation } \end{aligned}\) c. glycolysis \(\rightarrow\) oxidation of pyruvate \(\rightarrow\) citric acid cycle \(\rightarrow\) oxidative phosphorylation d. citric acid cycle \(\rightarrow\) glycolysis \(\rightarrow\) oxidative phosphorylation \(\rightarrow\) oxidation of pyruvate

Which of the following best describes complex IV in the electron transport chain? a. Complex IV consists of an oxygen molecule held between the cytochrome and copper ions. The electrons flowing finally reach the oxygen, producing water. b. Complex IV contains a molecule of flavin mononucleotide and iron-sulfur clusters. The electrons from NADH are transported here to coenzyme Q. c. Complex IV contains cytochrome b, c, and Fe-S. Here, the proton motive Q cycle takes place. d. Complex IV contains a membrane-bound enzyme that accepts electrons from FADH2 to make FAD. This electron is then transferred to ubiquinone.
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