BISC 333 General Microbiology: Course Introduction, Syllabus, and Study Strategies

Course Overview: General Microbiology

Course Structure and Materials

This course introduces students to the foundational concepts of microbiology, focusing on the microbial world, cell structure and function, microbial metabolism, growth, and diversity. The syllabus outlines the use of Brock Biology of Microorganisms as the primary textbook, supplemented by Mastering Microbiology for homework and readings. Students are expected to access all course materials and assignments via Blackboard and Top Hat platforms.

• Textbook: Brock Biology of Microorganisms (Madigan et al.)

• Online Platforms: Blackboard (for readings, assignments), Top Hat (for lectures, attendance, quizzes)

• Homework: Mastering Microbiology assignments due by noon the day after class

Course Schedule and Topics

The course schedule covers key chapters from the Brock Biology of Microorganisms, including:

• Ch. 1: The Microbial World

• Ch. 2: Microbial Cell Structure and Function

• Ch. 3: Microbial Metabolism

• Ch. 4: Microbial Growth and Its Control

• Ch. 5: Viruses and Their Multiplication

• Ch. 6: Molecular Information Flow and Protein Processing

• Ch. 7: Microbial Regulatory Systems

• Ch. 8: Molecular Aspects of Microbial Growth

• Ch. 9: Genetics of Bacteria and Archaea

• Ch. 10: Microbial Genomics and Other Omics

Labs are integrated with lecture topics, reinforcing practical skills and conceptual understanding.

Study Strategies for Microbiology

Effective Learning Approaches

Success in microbiology requires thoughtful, regular practice in critical thinking. Students are encouraged to engage with the material actively, connect concepts, and predict outcomes. The course emphasizes the importance of both storage and retrieval in memory, aiming for fluency and mastery.

• First Pass: Read for main points and big picture understanding.

• Second Pass: Analyze details in context of the big picture.

• Practice: Explain concepts, teach others, create and answer questions.

• Anticipate: Predict exam questions and practice under test conditions.

Using AI Tools Responsibly

AI tools should be used interactively to clarify concepts and deepen understanding, not to complete assignments. The goal is to foster independent learning and mastery of microbiology content.

Microbial World: Key Concepts

Microorganisms: Tiny Titans of the Earth

Microorganisms are the oldest form of life and constitute a major fraction of Earth's biomass. They are found everywhere, exhibit remarkable metabolic diversity, and typically live in communities. Microbes profoundly affect human life, including infectious diseases, food and water, soils, animal health, and fuel production.

• Definition: Microorganisms are microscopic organisms, including bacteria, archaea, viruses, fungi, and protozoa.

• Examples: Epulopiscium fishelsoni, Thiomargarita namibiensis (large prokaryotes)

• Applications: Medicine, agriculture, biotechnology, environmental science

Cell Size and Morphology

Cell morphology refers to the size and shape of microbial cells. Prokaryotes range from 0.2 µm to over 600 µm in diameter, while eukaryotic cells are typically 5–100 µm long. Eukaryotic cells are generally 10 times larger than prokaryotic cells.

• Micrometer (µm): 1 µm = $10^{-6}$ meters

• Prokaryote Size: 0.2–600+ µm diameter

• Eukaryote Size: 5–100 µm length

• Morphology: Bacillus (rod-shaped), coccus (spherical), spirillum (spiral)

Surface Area to Volume Ratio

The surface area to volume (S:V) ratio is a critical factor in cell biology, influencing exchange rates with the environment and limiting cell growth, division, and metabolism. For a sphere:

$\frac{S}{V} \sim \frac{3}{r}$

• Smaller cells: Higher S:V ratio, more efficient exchange

• Larger cells: Lower S:V ratio, slower exchange

• Shape: Influences S:V ratio and cellular processes

Growth in Microbiology

In microbiology, "growth" typically refers to an increase in cell number due to cell division, but can also mean growth in cell size. Clarifying the context is important: "cell growth" for size, "cell multiplication" for numbers.

• Cell Growth: Increase in cell size

• Cell Multiplication: Increase in cell number

Summary Table: Cell Size and Volume

The following table summarizes the size and volume of various bacterial cells, from largest to smallest:

Organism	Cell Size (µm)	Cell Volume (µm3)
Epulopiscium fishelsoni	600	~430,000
Thiomargarita namibiensis	100	~523,000
Escherichia coli	2	~4
Mycoplasma genitalium	0.2	~0.02
Additional info: Table values inferred from typical textbook data.

Conclusion

This introductory guide provides an overview of the course structure, key study strategies, and foundational concepts in microbiology. Students are encouraged to engage actively with the material, utilize available resources, and clarify terminology for effective learning.