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

19. Innate Immunity

Review of the Complement System

Microbiology

19. Innate Immunity

Review of the Complement System

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Multiple Choice

Which of the following are most susceptible to complement lysis?

Gram-positive bacteria.

Gram-negative bacteria.

Bacteriophages.

Prions.

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Verified step by step guidance

Understand the role of the complement system: The complement system is a part of the immune system that enhances the ability to clear microbes and damaged cells. It promotes inflammation and attacks the pathogen's cell membrane.

Identify the structure of Gram-positive and Gram-negative bacteria: Gram-positive bacteria have a thick peptidoglycan layer and no outer membrane, while Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane containing lipopolysaccharides.

Consider the mechanism of complement lysis: The complement system can form a membrane attack complex (MAC) that creates pores in the cell membrane, leading to cell lysis.

Analyze the susceptibility of different organisms: Gram-negative bacteria are more susceptible to complement lysis because the MAC can more easily penetrate their outer membrane compared to the thick peptidoglycan layer of Gram-positive bacteria.

Evaluate the other options: Bacteriophages and prions are not cellular organisms and do not have membranes that can be targeted by the complement system, making them less susceptible to complement lysis.