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Question 601
Microbiology → General
Classification
Question
SSBAQuestion Header
Which organism belongs to the facultative anaerobic group?
Question Stem
Which organism is facultative anaerobic rather than belonging to a strictly anaerobic group?
Options
A
Escherichia coli
B
Bacteroides fragilis
C
Actinomyces israelli
D
Clostridium perfringens
E
Clostridium difficile
Explanation
Escherichia coli is a facultative anaerobic bacterium. Clostridia, Bacteroides and Actinomyces are strictly anaerobic.
Option Validity
B) Bacteroides belongs to the strictly anaerobic group.
C) Actinomyces belongs to the strictly anaerobic group.
D) Clostridia are strictly anaerobic; Clostridium perfringens belongs to this group.
E) Clostridia are strictly anaerobic; Clostridium difficile belongs to this group.
Further Reading
Saxena R. Textbook for MRCOG-1: Basic Sciences in Obstetrics and Gynaecology. Chapter 6 — Microbiology and Immunology: Table 6.2 — Anaerobic bacteria. Printed page 185.