Graph reveals anaerobic respiration and temperature optimum for penicillin production

Steps:

• Observe that production rates are shown for two oxygen levels, implying oxygen's role in the process.
• Note if rates are similar or higher at low oxygen, indicating independence from high oxygen for respiration.
• Identify the peak production temperature across curves as approximately 24°C.
• Conclude respiration type from oxygen independence and optimum from graph peak.

Why C is correct:

• Penicillium's penicillin production persists at low oxygen, aligning with anaerobic respiration definition (energy production without oxygen).

Why the others are wrong:

• A: Includes aerobic respiration (1), but graph shows production without high oxygen need.
• B: Includes aerobic respiration (1), contradicted by low-oxygen viability.
• D: Includes aerobic respiration (1), which graph data refutes.

Final answer: C