Question

1. which of the following terms describes a microorganism that thrives in acidic environments (ph < 5.5)?

a) neutrophile
b) alkaliphile
c) acidophile
d) halophile

1. which type of bacteria requires oxygen to grow but at lower levels than atmospheric concentration?

a) obligate aerobe
b) microaerophile
c) facultative anaerobe
d) aerotolerant anaerobe

1. what term describes bacteria that can grow in both the presence and absence of oxygen but grow better with oxygen?

a) obligate anaerobe
b) facultative anaerobe
c) aerotolerant anaerobe
d) microaerophile

Explanation:

1. Acidophiles are microorganisms that thrive in acidic environments with a pH < 5.5. Neutrophiles prefer neutral pH, alkaliphiles thrive in alkaline conditions, and halophiles prefer high - salt environments.
2. Microaerophiles require oxygen to grow but at lower levels than atmospheric concentration. Obligate aerobes need full - atmospheric oxygen, facultative anaerobes can grow with or without oxygen, and aerotolerant anaerobes are not affected by oxygen but don't require it.
3. Facultative anaerobes can grow in both the presence and absence of oxygen but grow better with oxygen. Obligate anaerobes are killed by oxygen, aerotolerant anaerobes are indifferent to oxygen, and microaerophiles need low - level oxygen.

Answer:

1. c) Acidophile
2. b) Microaerophile
3. b) Facultative anaerobe