Table of contents

1. Introduction to Microbiology3h 22m
2. Disproving Spontaneous Generation1h 18m
3. Chemical Principles of Microbiology3h 38m
4. Water1h 28m
5. Molecules of Microbiology2h 23m
6. Cell Membrane & Transport3h 28m
7. Prokaryotic Cell Structures & Functions5h 52m
8. Eukaryotic Cell Structures & Functions2h 18m
9. Microscopes2h 46m
10. Dynamics of Microbial Growth4h 36m
11. Controlling Microbial Growth4h 10m
12. Microbial Metabolism5h 16m
13. Photosynthesis2h 31m
14. DNA Replication2h 25m
15. Central Dogma & Gene Regulation7h 14m
16. Microbial Genetics4h 44m
17. Biotechnology3h 0m
18. Viruses, Viroids, & Prions4h 56m
19. Innate Immunity7h 15m
20. Adaptive Immunity7h 14m
21. Principles of Disease6h 57m

9. Microscopes

Reviewing the Types of Staining

Microbiology

9. Microscopes

Reviewing the Types of Staining

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Multiple Choice

Which of these is considered a differential stain and why?

Flagella stain:differentiates the flagella from the rest of the structures of the cell.

Capsule stain:differentiates the capsule from the background behind the bacterium.

Gram-stain:differentiates two types of bacteria, gram-positive and gram-negative.

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Verified step by step guidance

Understand the concept of a differential stain: A differential stain is a technique used in microbiology to distinguish between different types of microorganisms or different structures within a single organism based on their staining properties.

Examine the purpose of each stain mentioned: The flagella stain is used to visualize the flagella, the capsule stain highlights the capsule, and the Gram stain differentiates between two major types of bacteria.

Identify the key feature of a differential stain: It should be able to differentiate between different types of cells or structures, not just highlight a single feature.

Analyze the Gram stain: The Gram stain is a classic example of a differential stain because it categorizes bacteria into two groups, Gram-positive and Gram-negative, based on the differences in their cell wall composition.

Conclude why the Gram stain is considered a differential stain: It provides critical information about the bacterial cell wall structure, which is essential for identification and classification, making it a differential stain.