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Chapter 22: Problem 14

The cell wall, a feature of most prokaryotes, is __________ a. interior to the cell membrane b. exterior to the cell membrane c. a part of the cell membrane d. interior or exterior, depending on the particular cell.

Short Answer

Expert verified
b. exterior to the cell membrane

Step by step solution

01

Title - Understand the question

The question asks where the cell wall is located in relation to the cell membrane in most prokaryotes.
02

Title - Recall the structure of prokaryotic cells

Prokaryotic cells are characterized by having a cell wall. The cell wall provides structural support and protection.
03

Title - Identify the relationship between cell wall and cell membrane

In prokaryotes, the cell membrane is the inner boundary that controls the movement of substances into and out of the cell. The cell wall is outside of this membrane, providing an additional layer of protection.
04

Title - Choose the correct option

Based on the understanding that the cell wall is outside the cell membrane in prokaryotes, choose option b: 'exterior to the cell membrane'.

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Key Concepts

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

Cell Wall
The cell wall is an essential structure in most prokaryotes, providing both support and protection. Unlike the cell membrane, which is flexible and primarily involved in regulating what enters and exits the cell, the cell wall is rigid and designed for strength. The cell wall gives the cell its shape and prevents it from bursting in environments with varying osmotic pressures. It is mainly made up of peptidoglycan in bacteria, a complex polymer that provides durability. This outer layer is critical for survival in harsh conditions, making it one of the defining features of prokaryotic cells.
Cell Membrane
The cell membrane, also known as the plasma membrane, is crucial for maintaining the internal environment of the cell. It is the boundary that separates the interior of the cell from its external environment. Made up of a lipid bilayer with embedded proteins, the cell membrane is selectively permeable. This means it carefully controls the substances that can enter and leave the cell, allowing the cell to maintain homeostasis. In prokaryotes, the cell membrane also plays a role in energy production, as it houses the machinery for processes such as respiration.
Prokaryotes
Prokaryotes are simple, single-celled organisms that lack a membrane-bound nucleus and other organelles. Examples include bacteria and archaea. They are characterized by their small size, usually ranging from 0.1 to 5 micrometers in diameter. Despite their simplicity, prokaryotes are incredibly diverse and can inhabit a wide range of environments, from extreme hot springs to the human gut.

  • Prokaryotic cells have a nucleoid region where the DNA is located, without a surrounding membrane.
  • They may have additional structures such as flagella for movement and pili for attachment and DNA transfer.
  • Their metabolism can be highly varied, with some prokaryotes performing photosynthesis, while others rely on chemical energy for growth and replication.

Understanding the basic structure and function of prokaryotes is essential for grasping more complex biological concepts, as they are the most ancient forms of life on Earth.

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