Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Introduction to Chemical Bonding

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Introduction to Chemical Bonding

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Multiple Choice

Which of the following staining procedures employs both a primary dye and a counterstain?

Acid-fast staining

Gram staining

Simple staining

Negative staining

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Verified step by step guidance

Understand the purpose of staining in microbiology: Staining is used to enhance the contrast of microscopic organisms, making them more visible under a microscope.

Learn about the Gram staining procedure: Gram staining is a differential staining technique that uses two dyes to classify bacteria into two groups based on the characteristics of their cell walls.

Identify the primary dye in Gram staining: The primary dye used in Gram staining is crystal violet, which initially stains all cells.

Recognize the role of the counterstain: After the application of a mordant (iodine) and decolorization with alcohol, a counterstain, usually safranin, is applied. This stains the cells that have lost the primary dye, allowing differentiation between Gram-positive and Gram-negative bacteria.

Compare with other staining methods: Acid-fast staining also uses a primary dye and a counterstain, but it is specific for identifying acid-fast bacteria. Simple staining uses only one dye, and negative staining involves staining the background instead of the organism.