Ch 3: Bacterial Biology: Help and Review

About This Chapter

The Bacterial Biology chapter of this Microbiology Help and Review course is the simplest way to master bacterial biology. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure you learn the essentials of bacterial biology.

Who's it for?

Anyone who needs help learning or mastering microbiology material will benefit from taking this course. You will be able to grasp the subject matter faster, retain critical knowledge longer and earn better grades. You're in the right place if you:

  • Have fallen behind in understanding how bacterial cells are classified and structured.
  • Need an efficient way to learn about bacterial biology.
  • Learn best with engaging auditory and visual tools.
  • Struggle with learning disabilities or learning differences, including autism and ADHD.
  • Experience difficulty understanding your teachers.
  • Missed class time and need to catch up.
  • Can't access extra science learning resources at school.

How it works:

  • Start at the beginning, or identify the topics that you need help with.
  • Watch and learn from fun videos, reviewing as needed.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Submit questions to one of our instructors for personalized support if you need extra help.
  • Verify you're ready by completing the Bacterial Biology chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the Bacterial Biology chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any relevant question. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

In this chapter, you'll learn the answers to questions including:

  • What criteria are used to classify bacterial cells?
  • What are the parts of a bacterial cell, and how do they function?
  • What are bacterial endospores, genomes and plasmids?
  • How do bacterial cells adapt to their environments and conjugate?
  • How does aerobic and anaerobic bacterial metabolism work?
  • What are the primary characteristics and growth needs of E. coli?

37 Lessons in Chapter 3: Bacterial Biology: Help and Review
Test your knowledge with a 30-question chapter practice test
Bacterial Cell Morphology and Classification: Definition, Shapes & Arrangements

1. Bacterial Cell Morphology and Classification: Definition, Shapes & Arrangements

Do all bacteria look the same? Definitely not! These tiny, singled-celled organisms come in a variety of morphologies, from cocci to spirals to tetrads. Many bacterial names even have clues to their morphology!

Bacterial Cytoplasm & Cell Membrane: Structure & Components

2. Bacterial Cytoplasm & Cell Membrane: Structure & Components

Some people say a bacterial cell is just a simple bag of enzymes. This couldn't be further from the truth! Learn about the structure and function of the bacterial cell membrane, what's in the cytoplasm, and how membrane surface area impacts bacterial size.

Bacterial Cell Walls: Structure, Function & Types

3. Bacterial Cell Walls: Structure, Function & Types

The bacterial cell wall has to be strong to prevent cell lysis but also porous to allow transport across the cell membrane. In this lesson, we will examine the structure of the bacterial cell wall and how it accomplishes both of these crucial tasks.

Bacterial Structures and Their Functions

4. Bacterial Structures and Their Functions

A bacterial cell is not smooth like a balloon. Bacteria can be covered with a wide range of structures like pili and capsules that give each species of bacteria different abilities. In this lesson, you will learn about several of these key external structures of bacteria.

Bacterial Endospores: Definition & Formation

5. Bacterial Endospores: Definition & Formation

Some bacteria have the ability to enter a state of suspended animation when conditions are unfavorable. In this lesson, we will examine the bacterial endospore and learn how and why bacteria produce these structures.

The Bacterial Genome: Structure & Organization

6. The Bacterial Genome: Structure & Organization

All organisms have DNA. While the basic structure of DNA is the same, the organization of the DNA in bacterial cells is very different than in human or animal cells. In this lesson we will explore the basics of the bacterial genome.

Bacterial Plasmids: Definition, Function & Uses

7. Bacterial Plasmids: Definition, Function & Uses

What if you could pick up bits of DNA and change your traits? In the animal kingdom, organisms are born with their lifetime total of DNA. In the bacterial world, cells can add to their genome by acquiring plasmids.

Bacterial Conjugation: Definition & Protocol

8. Bacterial Conjugation: Definition & Protocol

You probably didn't know that bacteria can engage in sexual reproduction. It is not what you think. In this lesson we will explore the process of bacterial conjugation and its impact on genetic variability in bacteria.

Bacterial Transformation: Definition, Process & Applications

9. Bacterial Transformation: Definition, Process & Applications

DNA is all around you. So are bacteria. Did you know that those bacteria can pick up and use that DNA? In this lesson we will examine the process of transformation and how bacteria are able to make use of environmental DNA.

Bacterial Transduction: Definition, Process & Advantages

10. Bacterial Transduction: Definition, Process & Advantages

Genetic diversity allows organisms to adapt to changing environmental conditions. In this lesson, we will explore bacterial transduction and how it allows bacteria to transfer genes and increase genetic diversity.

Regulation of Gene Expression: Transcriptional Repression and Induction

11. Regulation of Gene Expression: Transcriptional Repression and Induction

Do our genes work the same way all the time? How do we regulate the expression of our genes? Explore the various ways organisms control gene transcription through repression and induction of operons.

How An Operon Controls Transcription in a Prokaryotic Cell

12. How An Operon Controls Transcription in a Prokaryotic Cell

Is gene regulation really as simple as flipping a switch? What are the parts of an operon, and how do they function to control gene transcription? We'll study the lac operon to answer these questions.

Aerobic Bacterial Metabolism: Definition & Process

13. Aerobic Bacterial Metabolism: Definition & Process

Respiration is the process of converting nutrients into usable energy. Several different mechanisms exist in the bacterial world. In this lesson, we will examine the role of oxygen in bacterial aerobic respiration.

Anaerobic Bacterial Metabolism: Definition & Process

14. Anaerobic Bacterial Metabolism: Definition & Process

Bacteria are metabolically versatile and can grow in a range of environments. Many bacteria grow in environments without oxygen using anaerobic respiration and fermentation. This lesson will discuss the process of anaerobic respiration in bacteria.

Bacterial Fermentation Process & Products

15. Bacterial Fermentation Process & Products

Bacteria in anaerobic environments can break down organic compounds using fermentation. If you have ever eaten a fermented food, such as bread, yogurt or cheese, you have tasted the products of fermentation. Now, learn the details of this process.

Escherichia coli (E. coli) as a Model Organism or Host Cell

16. Escherichia coli (E. coli) as a Model Organism or Host Cell

A model organism can help scientists perform faster and more efficient biological research. This lesson examines the most utilized model organism, E. coli, and looks at the major characteristics that make it a perfect model.

Growth Requirements of E. coli and Auxotrophs

17. Growth Requirements of E. coli and Auxotrophs

Escherichia coli is a normal inhabitant of your gastrointestinal tract. In this lesson we will examine the conditions required for optimal growth of E. coli both in your colon and in culture.

Actinobacteria: Definition & Characteristics

18. Actinobacteria: Definition & Characteristics

This lesson covers a group of bacteria known as Actinobacteria. Learn about the unique characteristics of these bacteria and how they use these traits to survive.

Agglutination in Hematology: Definition & Examples

19. Agglutination in Hematology: Definition & Examples

Learn about how red blood cell hemagglutination works and the factors involved in the process. See how hemagglutination is used in the laboratory in an array of tests, from blood typing to the diagnoses of viral illnesses.

Agglutination in Microbiology: Definition & Examples

20. Agglutination in Microbiology: Definition & Examples

Discover the importance of agglutination, a process used by the immune system to inactivate invading foreign substances. Learn how agglutination is a tool used in the health care industry to diagnose illness.

Alphaproteobacteria: Definition & Characteristics

21. Alphaproteobacteria: Definition & Characteristics

Learn about the group of bacteria named Alphaproteobacteria, a subgroup of the phylum Proteobacteria. See how plant life benefits from the existence of this uniquely shaped group of bacteria.

Spirochetes: Definition & Characteristics

22. Spirochetes: Definition & Characteristics

Spirochetes are a type of bacteria. Bacteria are prokaryotic cells; a kind of cell that does not have a nucleus or other organelles. They are found everywhere and come in many shapes. This lesson will focus on the definition and characteristics of this tiny bacteria and how it may affect humans.

Aminoglycosides: List of Examples, Toxicity & Side Effects

23. Aminoglycosides: List of Examples, Toxicity & Side Effects

Many patients receive aminoglycoside antibiotics to treat infections. In this lesson, learn the names of the different aminoglycoside antibiotics and some of the problems a patient may experience when taking one of these antibiotics.

Bacteria: Cell Walls & Respiration

24. Bacteria: Cell Walls & Respiration

In this lesson we'll review what bacteria are and the structure of the cell wall. Then we'll learn the purpose of respiration in the cell and explain in detail how the cell wall allows for respiration in bacteria.

Difference Between Gram Positive & Negative Bacteria

25. Difference Between Gram Positive & Negative Bacteria

If you've ever had a bacterial infection, your doctor probably did a Gram stain to help figure out which kind of bacteria it is. This a common technique used by many labs and hospitals to identify and help combat a bacterial infection.

Difference Between Viral & Bacterial Infections

26. Difference Between Viral & Bacterial Infections

This lesson is on viral versus bacterial infections. In this lesson we'll cover what a virus is and how it is different from a bacterium. We'll also go over examples of viral and bacterial infections.

Entomopathogenic Nematodes, Fungi & Bacteria

27. Entomopathogenic Nematodes, Fungi & Bacteria

Do you know what the word entomopathogenic means? Do you know any organisms that would be considered emtomopathogenic? In this lesson you will learn the meaning of this word as well as some examples of organisms that can be described as such.

How are Bacteria Classified?

28. How are Bacteria Classified?

There are many different organisms on the planet; each one broken down into groups of similar organisms. In this lesson, you will learn how scientists have classified and grouped bacteria.

Kingdom Bacteria: Definition & Examples

29. Kingdom Bacteria: Definition & Examples

In this lesson, you will learn about Eubacteria. You will learn some of the major characteristics as well as some examples of this major group of bacteria.

Ammonification: Definition & Nitrogen Cycle

30. Ammonification: Definition & Nitrogen Cycle

This lesson will cover the basics of the nitrogen cycle. You will learn how nitrogen gets moved around in the environment, with a greater focus on one step of the cycle called ammonification.

Amphitrichous Flagella: Definition & Example

31. Amphitrichous Flagella: Definition & Example

Have you ever heard of the term amphitrichous flagella? In this lesson, we'll examine what this term means and look at some examples of organisms that have this type of flagella.

Do Bacteria Cells Have a Nucleus?

32. Do Bacteria Cells Have a Nucleus?

In this lesson we'll go over the differences in the basic types of cells, explaining what bacteria are and where they fit into the classification. Along the way, we'll discuss whether or not bacteria cells have a nucleus and how it affects them.

Do Bacteria Have a Cell Membrane?

33. Do Bacteria Have a Cell Membrane?

This lesson describes the structure and functions of a cell membrane. We'll learn how a cell membrane keeps the cell's contents contained and helps a cell to produce energy.

Ecological Importance of Bacteria

34. Ecological Importance of Bacteria

This lesson is on the ecological importance of bacteria. In this lesson, we'll learn what bacteria are and their place in the ecosystem. We'll go over the different jobs they do and examples of each.

What Is a Colony-Forming Unit? - Definition & Purpose

35. What Is a Colony-Forming Unit? - Definition & Purpose

Colony-forming unit describes how many bacteria were put onto a petri dish to grow into visible groups. How is the CFU used in science, and why is it important? Complete this lesson to find the answers.

What is Acetobacter Aceti?

36. What is Acetobacter Aceti?

The bacterium Acetobacter aceti is excellent at metabolizing ethanol into acetic acid. How does this little bacterium affect a wide variety of ecological niches, and even drive human economy just by doing what it does every day? This lesson describes what Acetobacter aceti is and why it is so important.

Bacillus Subtilis: Characteristics & Arrangement

37. Bacillus Subtilis: Characteristics & Arrangement

This lesson will discuss the characteristics of the bacterium Bacillus subtilis, including its microscopic characteristics, its metabolism, and its use by humans.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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