1. About Science Prof Online
PowerPoint Resources
Science Prof Online (SPO) is a free science education website that provides fully-developed Virtual Science Classrooms, science-related PowerPoints, articles and images. The site is designed to be a helpful resource for students, educators, and anyone interested in learning about science.
The SPO Virtual Classrooms offer many educational resources, including practice test questions, review questions, lecture PowerPoints, video tutorials, sample assignments and course syllabi. New materials are continually being developed, so check back frequently, or follow us on Facebook (Science Prof Online) or Twitter (ScienceProfSPO) for updates.
Many SPO PowerPoints are available in a variety of formats, such as fully editable PowerPoint files, as well as uneditable versions in smaller file sizes, such as PowerPoint Shows and Portable Document Format (.pdf), for ease of printing.
Images used on this resource, and on the SPO website are, wherever possible, credited and linked to their source. Any words underlined and appearing in blue are links that can be clicked on for more information. PowerPoints must be viewed in slide show mode to use the hyperlinks directly.
Several helpful links to fun and interactive learning tools are included throughout the PPT and on the Smart Links slide, near the end of each presentation. You must be in slide show mode to utilize hyperlinks and animations.
This digital resource is licensed under Creative Commons Attribution-ShareAlike 3.0:
Welcome to Science Prof Online PowerPoint Resources!
This PowerPoint Presentation comes from the Virtual Cell Biology Classroom of Science Prof Online, and, as such, is licensed under Creative Commons Attribution-ShareAlike 3.0.; meaning you can download, share and alter any of this presentation, but you can’t sell it or repackage and sell any part of it. Please credit Science Prof Online as the source of this presentation. Please abide by credited image copyrights. Thank you for using this resource.
Alicia Cepaitis, MS
Chief Creative Nerd
Science Prof Online
Online Education Resources, LLC
Tami Port, MS
Creator of Science Prof Online
Chief Executive Nerd
Science Prof Online
Online Education Resources, LLC
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Compound microscope objectives, T. Port

2. Biological Cell Structure & Function
Images: M. Ruiz
From the Virtual Biology Classroom on ScienceProfOnline.com

3. Two Basic Types of Cells
Prokaryotic Cells
Eukaryotic Cells
Cells:
are the building blocks of life!
All living things are made of one or more cells.
only come from other cells.
are , really small. How small are they?
small because of surface to volume ratio
WATCH THIS!
Introduction to Cell Video
Images: Prokaryotic cell diagram & Eukaryotic cell diagram, M. Ruiz
From the Virtual Biology Classroom on ScienceProfOnline.com

4. Size of Living Things Click link for an interactive
1 m = 100 cm = 1,000mm = 1,000,000 µm = 1,000,000,000nm
1mm = 1000 µm = nm
1 µm = 1000nm
Click link for an interactive
“Size of Microscopic Things”
animation on Cells Alive.
From the Virtual Biology Classroom on ScienceProfOnline.com

5. Old School 5 Kingdom classification of organisms
Eukaryotes
Prokaryotes
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Phylogenetic Tree, Wiki

6. Prokaryotes (Bacteria)
Binary Fission
Tell me about Prokaryotes…
Check out these quick animated lessons on
binary fission:
(Please watch both, as each provides different and useful information.)
Binary Fission Animation
from ClassZone
From McGraw-Hill
Prokaryotes …
Reproduce by means of binary fission.
Do not have a cell nucleus or any other organelles with membranes. Plasma membrane their only membrane.
DNA travels openly around the cell.
All bacteria are prokaryotes.
Images: Prokaryotic cell diagram, M. Ruiz, Binary fission, JW Schmidt
From the Virtual Biology Classroom on ScienceProfOnline.com

7. Bacterial Genetics Nucleoid Plasmid
Region of cytoplasm where prokaryote’s genome (DNA) is located.
Usually a singular, circular chromosome.
Plasmid
Small extra piece of chromosome/genetic material.
genes
Not critical to everyday functions.
Can provide genetic information to promote:
- Antibiotic resistance
- Virulence factors
(molecules produced by pathogen that specifically influence host's function to allow the pathogen to thrive)
- Promote conjugation
(transfer of genetic material between bacteria through cell- to-cell contact)
Image: Prokaryotic Cell Diagram: M. Ruiz, Bacterial conjugation, Adenosine
From the Virtual Biology Classroom on ScienceProfOnline.com

8. Cytoplasm Granules Prokaryotes Bacteria Also known as proto-plasm.
Gel-like matrix of water, enzymes, nutrients, wastes, and gases and
contains cell structures.
Location of growth, metabolism, and replication.
Granules
Bacteria’s way of storing nutrients.
Staining of some granules aids in identification.
Image: Prokaryotic cell diagram: M. Ruiz, Granules, Source Unknown
From the Virtual Biology Classroom on ScienceProfOnline.com

9. Cytoskeleton Prokaryotes Bacteria
Cellular "scaffolding" or "skeleton" within the cytoplasm.
Major advance in prokaryotic cell biology in the last decade has been discovery of the prokaryotic cytoskeleton.
Up until recently, thought to be a feature only of eukaryotic cells.
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Prokaryotic Cell: M. Ruiz

10. Click here for animation of ribosome building a protein.
Prokaryotes Bacteria
Ribosomes
Found within cytoplasm or attached to plasma membrane.
Made of protein & rRNA.
Composed of two subunits.
Cell may contain thousands .
Q: What do ribosomes do?
Q: What’s the relationship between the job that the ribosomes do and the genetic instructions (nucleic acids) of the cell?
Click here for animation of ribosome building a protein.
Animation: Ribosome translating protein,; Xvazquez; Ribosome Structure, Vossman
From the Virtual Biology Classroom on ScienceProfOnline.com

11. Prokaryotes Plasma Membrane
Separates the cell from its environment.
Phospholipid molecules oriented so that hydrophilic water-loving heads directed outward and hydrophobic water-hating tails directed inward.
Proteins embedded in two layers of lipids (lipid bilayer).
Membrane is semi-permeable. Q: What does that mean?
Some materials can move across the membrane, others cannot.
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Cell Membrane diagram, Dhatfield

12. Bacterial Cell Wall Gram-positive
Peptidoglycan is a huge polymer of interlocking chains of alternating sugar monomers held together with peptide bridges.
Provides rigid support while freely permeable to solutes.
Two main types of bacteria cell wall.
Gram-positive
Gram-negative
Image: Bonding structure peptidoglycan,
Mouagip; Gram-positive and Gram-negative 100xTM
From the Virtual Biology Classroom on ScienceProfOnline.com

13. Bacterial Cell Wall Gram-Positive & Gram-Negative
Q: Why are these differences in bacterial cell wall structure important?
Gram-positive
Peptidoglycan makes up as much as 90% of the thick, compact cell wall.
Gram-negative
More chemically complex and thinner.
Peptidoglycan only 5 – 20% of the cell wall.
Peptidoglycan not outermost layer, between the plasma membrane and the outer membrane.
Outer membrane is similar to the plasma membrane, but is less permeable and composed of lipopolysaccharides (LPS).
LPS is a harmful substance classified as an endotoxin,
The space between the cell wall and the plasma membrane is called the periplasm.
From the Virtual Biology Classroom on ScienceProfOnline.com
Images: Sources Unknown

14. Bacterial Endospores
Dormant, tough, non-reproductive structure produced by small number of bacteria.
Resistant to radiation, desiccation, lysozyme, temperature, starvation, and chemical disinfectants.
Endospores are commonly found in soil and water, where they may survive for very long periods of time.
Image: Bacillus subtilis, SPO Science Image Library; , Clostridium botulinum, PHIL #2107
From the Virtual Biology Classroom on ScienceProfOnline.com

15. Bacterial Genus : Clostridium
GRAM-POSITIVE
Obligate anaerobes
bacillus-shaped
endospore producer
The members of this genus have a couple of bacterial “superpowers” that make them particularly tough pathogens.
They produce endospores
Also produce a variety of toxins, some of which are fatal.
- Clostridium tetani = agent of tetanus
- C. botulinum = agent of botulism
- C. perfringens = one of the agents of gas gangrene
- C. difficile = part of natural intestinal flora, but resistant strains can proliferate and cause pseudomembranous colitis.
Produce endospores
Produce toxins
Images: Man with Tetanus, Sir Charles Bell; Nails, Wiki; Wet Gangrene, Wiki
From the Virtual Biology Classroom on ScienceProfOnline.com

16. Prokaryotes Surface Appendages
Some prokaryotes have distinct appendages that allow them to move about or adhere to solid surfaces.
Consist of delicate stands of proteins.
A couple example of prokaryotic surface appendages:
flagella: Long, thin extensions that allow some bacteria to move about freely in aqueous environments. (singular: flagellum)
fimbriae: Most Gram-negative bacteria have these short, fine appendages surrounding the cell. Gram+ bacteria don’t have.
Help bacteria stick to solid surfaces. Major
factor in virulence. (singular: fimbria)
From the Virtual Biology Classroom on ScienceProfOnline.com
Images: Helicobacter pylori; E. coli fimbriae, Manu Forero

17. REVIEW! Here’s are two excellent interactive lessons:
Prokaryote Cell Structure from Cells Alive
Interactive Cell Structure from Wiley
From the Virtual Biology Classroom on ScienceProfOnline.com
Images: Prokaryotic cell diagram, M. Ruiz

18. Eukaryotic Cells Eu =“true”, karyon=“nucleus”
Genetic material contained in a nuclear membrane.
Membrane bound organelles.
Include animal, plant, fungi, algae cells as well as other microscopic eukaryotes.
Evolved from prokaryotic cells.
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Eukaryotic Cell Diagram, M. Ruiz 18

19. Old School 5 Kingdom classification of organisms
Eukaryotes
Prokaryotes
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Phylogenetic Tree, Wiki

20. Cytoplasm Nicknames: The Matrix, Q: Eukaryotes? Prokaryotes? Both?
Molecular Chowder
Fills the space between the plasma membrane and the nuclear membrane
A water-like substance that fills cells.
Consists of cytosol and cellular organelles except for the cell nucleus.
cytosol is made up of water, salts, organic molecules and many enzymes that catalyze reactions.
Q: Eukaryotes? Prokaryotes? Both?
From the Virtual Cell Biology Classroom on ScienceProfOnline.com
Image: Eukaryotic Cell Diagram, M. Ruiz 20

21. Cytoskeleton Nicknames: Scaffolding, Highways
Maintains cell shape.
Protects the cell.
Enables some cell movement (using structures such as flagella and cilia).
Plays important roles in intra-cellular transport (the movement of vesicles and organelles).
Plays important role in cell division.
Q: Eukaryotes? Prokaryotes? Both?
From the Virtual Biology Classroom on ScienceProfOnline.com
Images: Fluoresced Eukaryotic Cell, NIH.

22. Surface Appendages: Cilia & Flagella
External appendages from cell membrane.
Aid in locomotion of the cell or movement of materials around cell.
Cytoskeleton on inside, plasma membrane on outside.
Images: Cilia of the lung trachea epithilium, Charles Daghlian, Cilum Diagram & Flagellum Diagram, M. Ruiz; Sperm & Egg, Wiki
From the Virtual Biology Classroom on ScienceProfOnline.com 22

23. CYTOSKELETON: Microfilaments, Intermediate Filaments & Microtubules
Network of protein fibers running throughout the cytoplasm
that give a cell its shape & provide a basis for movement.
1. Microfilaments
Two intertwined strands of actin protein.
2. Intermediate Filaments
Fibrous proteins supercoiled into thick cables.
3. Microtubules
Hollow tubes of tubulin
Cell shape, cell movement, chromosome movement during division
“Highways” along which the organelles travel and are conveyed.
Microtubules may work alone, or join with other proteins to form more complex
structures called cilia, flagella or centrioles.
CYTOSKELETON: Microfilaments, Intermediate Filaments & Microtubules
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Source Unknown

24. CYTOSKELETON: Centrioles & Centrosomes
The centrosome, also called the "microtubule organizing center", is an area in the cell where microtubles are produced.
Within the cells of animals are a pair of centriole, made of nine sets of triplet microtubules.
Microtubules > Centriole > Centrosome
Images: Centriole Cross-section & Centriole-3D, Twooars; Micrograph of Centrioles, Christos Chinopoulos
From the Virtual Biology Classroom on ScienceProfOnline.com

25. Click here for animation of ribosome building a protein.
Ribosomes
Click here for animation of ribosome building a protein.
Q: What do ribosomes do?
Q: What are they made of?
Can be found alone in the cytoplasm, in groups called polyribosomes, or attached to the endoplasmic reticulum.
Q: Eukaryotes? Prokaryotes? Both?
Q 1: Make proteins from instructions originally encoded in DNA instructions.
Q 2: rRNA and proteins
Q3: Both
Images: Ribosome translating protein, animation, Xvazquez; Ribosome Structure, Vossman
From the Virtual Biology Classroom on ScienceProfOnline.com 25

26. Membrane-bound Organelles
Eukaryotic cells have many organelles.
Prokaryotes only have ribosomes, which are not bound by a membrane.
Membrane-bound eukaryotic organelles organize functions within the cell.
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Eukaryotic Cell Diagram, M. Ruiz 26

27. The Endomembrane System consists of:
System of internal membranes within eukaryotic cells that divide the cell into compartments, or organelles.
Transport system, for moving molecules, into, out of, and through interior of cell, as well as interactive surfaces for lipid and protein synthesis.
Membranes of the endomembrane system are made of a lipid bilayer, with proteins.
The Endomembrane System
consists of:
1. nucleus
2. endoplasmic reticulum
3. Golgi apparatus
4. vesicles
5. lysosomes
6… Q: What other membranous part of the cell should also be included in this list?
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Endomembrane system diagram, M. Ruiz 27

28. ENDOMEMBRANE SYSTEM ORGANELLES: Nucleus
Nickname: Control Center
Separates the genetic material (DNA) from the rest of the cell.
DNA, the genetic material, is a blueprint, or code for making proteins.
nuclear membrane is the double membrane structure that separates nucleus from cytoplasm.
Images: Endomembrane system diagram,& Nucleus diagram, M. Ruiz
From the Virtual Biology Classroom on ScienceProfOnline.com

29. Endoplasmic Reticulum
ENDOMEMBRANE SYSTEM ORGANELLES:
Endoplasmic Reticulum
Nickname:
Production Factory (makes proteins and lipids)
System of membranous channels and vesicles.
Internal production & delivery system of the cell.
Rough ER is studded with ribosomes. Site of protein synthesis and processing.
Smooth ER lacks ribosomes. Site of synthesis of phospholipids and packaging of proteins into vesicles.
Images: Endomembrane system diagram, M. Ruiz, ER photomicrograph, Louisa Howard.
From the Virtual Biology Classroom on ScienceProfOnline.com

30. ENDOMEMBRANE SYSTEM ORGANELLES : Golgi apparatus
Nickname:
Assembly Factory
Takes simple molecules and puts them together into more complex macromolecules.
Packages, modifies, and transports materials to different location inside/outside of the cell.
Consists of a stack of curved saccules.
Receives protein and also lipid-filled vesicles from the ER, packages, processes, and distributes them within the cell or for export out of the cell (secretion).
Also encloses digestive enzymes into membranes to form lysosomes.
Images: Endomembrane system diagram, M. Ruiz, Golgi apparatus photomicrograph, Louisa Howard.
From the Virtual Biology Classroom on ScienceProfOnline.com

31. ENDOMEMBRANE SYSTEM ORGANELLES: Vesicles
Nickname: The Trucks
Store, transport, or digest cellular products and waste.
Small compartments separated from the cytosol by at least one lipid bilayer.
Made in Golgi apparatus, ER, or from parts of the plasma membrane.
Vesicles form while taking in (endocytosis) or discharging (exocytosis) materials.
REVIEW: Animation on endocytosis & exocytosis
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Endomembrane system diagram, M. Ruiz

32. ENDOMEMBRANE SYSTEM ORGANELLES: Lysosomes
Nickname:
Recycling Trucks
Break down food into particles and also destroy old cellular components.
Q: Which organelle produces lysosomes?
Contain hydrolytic enzymes and are involved in intracellular digestion.
A: Golgi apparatus
Images: Endomembrane system diagram, M. Ruiz,
Lysosome action diagram, Encyclopedia of Science
From the Virtual Biology Classroom on ScienceProfOnline.com

33. ENDOMEMBRANE SYSTEM ORGANELLES: Plasma Membrane
Q: What is it made of?
Q: What is its function?
Image: Endomembrane system diagram, M. Ruiz Cell Membrane diagram, Wiki
From the Virtual Biology Classroom on ScienceProfOnline.com

34. Organelles: Energy-Related
Mitochondria
&
Chloroplast
Both organelles house energy in the form of ATP.
Both ancestrally were independent cells that formed a symbiotic relationship with other cells.
Q: Eukaryotes? Prokaryotes? Both?
Found in nearly all eukaryotes
Found in plants & algae & some microbes
Images: Mitochondrion diagram M. Ruiz; Chloroplast diagram, Wiki
From the Virtual Biology Classroom on ScienceProfOnline.com 34

35. REVIEW! Here’s are two excellent interactive lessons:
1. Eukaryotic Cell Structure from Cells Alive
2. Interactive Cell Structure from Wiley
From the Virtual Biology Classroom on ScienceProfOnline.com
Images: Prokaryotic cell diagram, M. Ruiz

36. Plant Cells Now let’s learn about additional structures found in
From the Virtual Biology Classroom on ScienceProfOnline.com
Images: All images by T. Port

37. ENERGY-RELATED ORGANELLES: Chloroplasts
Nickname:
Solar Panels
Captures sunlight energy to make ATP.
chlorophyll (a green pigment) absorbs solar energy and carbohydrates are made in the stroma.
Images: Plant cells with chloroplasts, Kristian Peters, Chloroplast diagram, Wiki
From the Virtual Biology Classroom on ScienceProfOnline.com

38. PLANT CELL: Vacuole Nickname: Reservoir Stores water.
Section 7-2
Nickname: Reservoir
Please water
me!
Stores water.
This is what makes lettuce crisp.
When there is low water, the plant wilts.
Images: Osmosis Plant Cell, M. Ruiz; Other Images Source Unknown
From the Virtual Biology Classroom on ScienceProfOnline.com

39. PLANT CELLS: Cell Wall
Function: Provides support and protection to the cell membrane
Found outside the cell membrane in plant cells.
From the Virtual Biology Classroom on ScienceProfOnline.com
Images: Plant cell, M. Ruiz

40. Animal Cell (Eukaryote)
From the Virtual Biology Classroom on ScienceProfOnline.com
Images: Animal cell diagram , M. Ruiz

41. Plant Cell (Eukaryote)
From the Virtual Biology Classroom on ScienceProfOnline.com
Image: Plant cell diagram, M. Ruiz

42. (You must be in PPT slideshow view to click on links.)
Confused?
Links to resources that further explain Cell Biology:
Prokaryotic Cells Main Page on the Virtual Cell Biology Classroom
of Science Prof Online website.
Prokaryotic Cell: Structures, Functions & Diagrams, an article from SPO.
Prokaryotic Cell interactive diagram from Cells Alive website.
Eukaryotic Cells Main Page on the Virtual Cell Biology Classroom of Science Prof Online.
Prokaryotic & Eukaryotic: Two Types of Biological Cells, an article from SPO.
Eukaryotic Cell: Structures, Functions & Diagrams, an article from SPO.
“Cells” music video by They Might Be Giants.
Cells Alive interactive website.
Cell Structure tutorials and quizzes from Interactive Concepts in Biochemistry.
Eukaryotic Cell Tour an Animated Science Tutorial.
Endomembrane System animation and quiz.
Endocytosis / Exocytosis animation and quiz from McGraw Hill.
Biology4Kids – Cell Biology Main Page by Raders.
(You must be in PPT slideshow view to click on links.)
Smart Links
From the Virtual Biology Classroom on ScienceProfOnline.com