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Boundless Biology
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Chapter 4

Cell Structure

Book Version 32
By Boundless
Boundless Biology
Biology
by Boundless
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Section 1
Studying Cells
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Cells as the Basic Unit of Life

A cell is the smallest unit of a living thing and is the basic building block of all organisms.

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Microscopy

Microscopes allow for magnification and visualization of cells and cellular components that cannot be seen with the naked eye.

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Cell Theory

Cell theory states: living things are composed of one or more cells; the cell is the basic unit of life; cells arise from existing cells.

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Cell Size

Cell size is limited in accordance with the ratio of cell surface area to volume.

Section 2
Prokaryotic Cells
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Characteristics of Prokaryotic Cells

A prokaryote is a simple, unicellular organism that lacks an organized nucleus or other membrane-bound organelle.

Section 3
Eukaryotic Cells
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Characteristics of Eukaryotic Cells

A eukaryotic cell has a true membrane-bound nucleus and has other membranous organelles that allow for compartmentalization of functions.

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The Plasma Membrane and the Cytoplasm

The plasma membrane is made up of a phospholipid bilayer that regulates the concentration of substances that can permeate a cell.

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The Nucleus and Ribosomes

Found within eukaryotic cells, the nucleus contains the genetic material that determines the entire structure and function of that cell.

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Mitochondria

Mitochondria are organelles that are responsible for making adenosine triphosphate (ATP), the cell's main energy-carrying molecule.

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Comparing Plant and Animal Cells

Although they are both eukaryotic cells, there are unique structural differences between animal and plant cells.

Section 4
The Endomembrane System and Proteins
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Vesicles and Vacuoles

Vesicles and vacuoles are membrane-bound sacs that function in storage and transport.

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The Endoplasmic Reticulum

The endoplasmic reticulum is an organelle that is responsible for the synthesis of lipids and the modification of proteins.

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The Golgi Apparatus

The Golgi apparatus sorts and packages materials before they leave the cell to ensure they arrive at the proper destination.

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Lysosomes

Lysosomes are organelles that digest macromolecules, repair cell membranes, and respond to foreign substances entering the cell.

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Peroxisomes

Peroxisomes neutralize harmful toxins and carry out lipid metabolism and oxidation reactions that break down fatty acids and amino acids.

Section 5
The Cytoskeleton
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Microfilaments

Microfilaments, which are the thinnest part of the cytoskeleton, are used to give shape to the cell and support all of its internal parts.

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Intermediate Filaments and Microtubules

Microtubules are part of the cell's cytoskeleton, helping the cell resist compression, move vesicles, and separate chromosomes at mitosis.

Section 6
Connections between Cells and Cellular Activities
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Extracellular Matrix of Animal Cells

The extracellular matrix of animal cells holds cells together to form a tissue and allow tissues to communicate with each other.

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Intercellular Junctions

Intercellular junctions provide plant and animal cells with the ability to communicate through direct contact.

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Biological Macromolecules
  • Synthesis of Biological Macromolecules
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Chapter 4
Cell Structure
  • Studying Cells
  • Prokaryotic Cells
  • Eukaryotic Cells
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Structure and Function of Plasma Membranes
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