Ch. 3 The Cellular Level of Organization

Martini - Fundamentals of Anatomy and Physiology 12th Edition

Martini, Nath, Bartholomew12th EditionFundamentals of Anatomy and PhysiologyISBN: 9780137854011Not the one you use?Change textbook

Martini, Nath, Bartholomew 12th Edition

Ch. 3 The Cellular Level of Organization

Problem 30

Chapter 3, Problem 30

What is the benefit of having some of the cellular organelles enclosed by a membrane similar to the plasma membrane?

Verified step by step guidance

Understand that cellular organelles enclosed by membranes, such as the nucleus, mitochondria, and endoplasmic reticulum, have membranes similar in structure to the plasma membrane, primarily composed of a phospholipid bilayer with embedded proteins.

Recognize that these membranes create distinct internal environments within the organelles, allowing specific biochemical processes to occur efficiently and without interference from the rest of the cell.

Consider that membrane enclosure allows selective transport of molecules in and out of the organelle, maintaining optimal conditions such as pH, ion concentration, and substrate availability necessary for the organelle's function.

Acknowledge that compartmentalization via membranes helps isolate potentially harmful reactions or substances, protecting the rest of the cell from damage and maintaining overall cellular homeostasis.

Summarize that the benefit of membrane-enclosed organelles is to enhance cellular efficiency and regulation by creating specialized microenvironments, enabling complex and diverse cellular activities to occur simultaneously.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Membrane-bound Organelles

Membrane-bound organelles are specialized structures within a cell enclosed by lipid bilayers similar to the plasma membrane. This enclosure allows them to maintain distinct internal environments, enabling specific biochemical reactions to occur efficiently and without interference from other cellular processes.

Compartmentalization

Compartmentalization refers to the division of the cell into separate areas by membranes, which helps isolate different metabolic pathways. This separation increases cellular efficiency by preventing conflicting reactions from occurring simultaneously and allows for better regulation of cellular activities.

Selective Permeability and Transport

Membranes surrounding organelles are selectively permeable, controlling the movement of substances in and out. This selective transport ensures that necessary molecules enter the organelle while waste products and harmful substances are kept out, maintaining optimal conditions for organelle function.

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Related Practice

Textbook Question

A molecule that blocks the ion channels lining integral proteins in the plasma membrane would interfere with

(a) Cell recognition

(b) The movement of lipid-soluble molecules

(d) The ability of protein hormones to stimulate the cell

(e) The cell's ability to divide

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Textbook Question

The transport of a certain molecule exhibits the following characteristics:

(1) The molecule moves down its concentration gradient;

(2) at concentrations above a given level, the rate of transport does not increase; and

(3) cellular energy is not required for transport to occur.

Which transport process is at work?

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Textbook Question

Solutions A and B are separated by a selectively permeable barrier. Over time, the level of fluid on side A increases. Which solution initially had the higher concentration of solute?

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