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

7. Prokaryotic Cell Structures & Functions

Prokaryotic Flagellar Structure

Microbiology

7. Prokaryotic Cell Structures & Functions

Prokaryotic Flagellar Structure

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Multiple Choice

Why do gram-negative flagellar basal bodies have an L-ring while gram-positive flagellar basal bodies do not?

Gram-positive bacterial cells do not have an outer membrane where the L-ring is located.

Gram-negative bacterial cells have larger flagella and require more basal body rings for support.

Gram-negative bacterial cells have a thicker cell wall and require the L-ring for support.

Gram-positive bacterial cells have a P-ring which performs the same functions as the L-ring in gram-negative cells.

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Verified step by step guidance

Understand the structure of gram-positive and gram-negative bacterial cell walls. Gram-positive bacteria have a thick peptidoglycan layer, while gram-negative bacteria have a thin peptidoglycan layer and an outer membrane.

Recognize that the flagellar basal body is a complex structure that anchors the flagellum to the cell wall and membrane, allowing for motility.

Identify the components of the flagellar basal body in gram-negative bacteria, which include the L-ring, P-ring, MS-ring, and C-ring. The L-ring is located in the outer membrane.

Note that gram-positive bacteria lack an outer membrane, which is why they do not have an L-ring in their flagellar basal body structure.

Conclude that the presence of the L-ring in gram-negative bacteria is due to the need for additional support and anchoring in the outer membrane, which is absent in gram-positive bacteria.