Skip to main content
Ch. 11 - Characterizing and Classifying Prokaryotes
Bauman - Microbiology with Diseases by Taxonomy 6th Edition
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302당신이 사용하는 게 아니라요?교과서 변경
11장, 문제 10

The presence of mycolic acid in the cell wall characterizes __________ .


a. Corynebacterium
b. Listeria
c. Nocardia
d. Mycobacterium

검증된 단계별 안내
1
Step 1: Understand what mycolic acid is. Mycolic acids are long-chain fatty acids found in the cell walls of certain bacteria, providing a waxy, hydrophobic layer that contributes to their unique staining properties and resistance to chemical damage and dehydration.
Step 2: Recall which bacterial genera are known to have mycolic acid in their cell walls. This feature is characteristic of bacteria that have a complex, lipid-rich cell wall structure.
Step 3: Review the options given: Corynebacterium, Listeria, Nocardia, and Mycobacterium. Among these, some genera are known for having mycolic acids, while others are not.
Step 4: Identify that Mycobacterium is the genus most famously associated with the presence of mycolic acid, which is a key factor in their acid-fast staining property.
Step 5: Conclude that the presence of mycolic acid in the cell wall characterizes the genus Mycobacterium.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
3m
도움이 되었나요?

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Mycolic Acid

Mycolic acids are long-chain fatty acids found in the cell walls of certain bacteria. They provide a waxy, hydrophobic barrier that makes the bacteria resistant to chemical damage and dehydration. This unique component is key to the acid-fast property of some bacteria, affecting staining and antibiotic susceptibility.
추천 영상:
02:45
Acids

Acid-Fast Bacteria

Acid-fast bacteria possess cell walls rich in mycolic acid, which prevents them from being decolorized by acid-alcohol after staining. This characteristic is used to identify genera like Mycobacterium and Nocardia. Acid-fast staining techniques, such as the Ziehl-Neelsen stain, are essential for detecting these bacteria.
추천 영상:
02:45
Acids

Bacterial Genera with Mycolic Acid

Among bacteria, genera such as Mycobacterium and Nocardia contain mycolic acid in their cell walls. Mycobacterium is the most well-known genus characterized by this feature, including pathogens like M. tuberculosis. Corynebacterium and Listeria lack significant mycolic acid and do not exhibit acid-fastness.
추천 영상:
02:45
Acids