Question

Know the different atmospheric conditions needed by strict aerobe, facultative anaerobe, microaerophile, and obligate anaerobe.

A) To determine their size.
B) To classify them based on shape.
C) To identify their metabolic preferences.
D) To study their genetic material.

Answer 1

Strict aerobes require oxygen, facultative anaerobes can grow with or without oxygen, microaerophiles prefer lower oxygen levels, and obligate anaerobes cannot survive in the presence of oxygen.

Step-by-step explanation:

Strict aerobes require an environment with oxygen, as they rely on aerobic respiration to make ATP. Examples of strict aerobes include Mycobacterium tuberculosis and Pseudomonas aeruginosa.

Facultative anaerobes can grow in the presence or absence of oxygen, but they prefer oxygen when it is available. They use aerobic respiration in the presence of oxygen and switch to fermentation or anaerobic respiration in the absence of oxygen. Escherichia coli and Staphylococcus aureus are examples of facultative anaerobes.

Microaerophiles prefer environments with lower levels of oxygen than normal atmospheric conditions. They still use aerobic respiration, but at reduced oxygen concentrations. Examples of microaerophiles include Campylobacter jejuni and Helicobacter pylori.

Obligate anaerobes cannot survive in the presence of oxygen and use fermentation or anaerobic respiration to make ATP. They are typically found in environments without oxygen. Examples of obligate anaerobes include Clostridium botulinum and Bacteroides fragilis.