Question

how do obligate aerobes and obligate anaerobes differ in their interactions with the atmosphere?
a. obligate aerobes cannot survive in the presence of atmospheric oxygen, while obligate anaerobes can.
b. obligate aerobes take in atmospheric oxygen, while obligate anaerobes take in atmospheric carbon dioxide
c. obligate aerobes release carbon dioxide into the atmosphere, while obligate anaerobes release oxygen.
d. obligate aerobes require oxygen from the atmosphere for survival, while obligate anaerobes do not.

Explanation:

To solve this, we analyze each option:

• Option A: Incorrect. Obligate aerobes need oxygen, obligate anaerobes cannot survive with oxygen.
• Option B: Incorrect. Obligate anaerobes do not take in carbon dioxide for survival (they don't use it as a respiratory gas like that).
• Option C: Incorrect. Both typically release carbon dioxide (from respiration), not oxygen (anaerobes don't release oxygen).
• Option D: Correct. Obligate aerobes require atmospheric oxygen for respiration/survival. Obligate anaerobes are poisoned by oxygen and do not need it.

Answer:

D. Obligate aerobes require oxygen from the atmosphere for survival, while obligate anaerobes do not.