Optimal Temperature for Aerobic Respiration in Yeast

Steps:

• Identify that aerobic respiration in yeast requires oxygen and is temperature-dependent, peaking at an optimal range.
• Recall yeast's optimal temperature is around 30–40°C for enzyme activity in respiration.
• Note the question specifies maintaining temperature for rate investigation, implying a controlled optimal value.
• Select the choice matching this range, given as A.

Why A is correct:

• A states 37°C, which aligns with the optimal temperature for yeast enzymes in aerobic respiration, maximizing ATP production via the definition of enzyme kinetics where rate peaks at biological optimum.

Why the others are wrong:

• B (likely low, e.g., 20°C): Too cold, slowing enzyme activity below optimal rate.
• C (likely high, e.g., 50°C): Denatures enzymes, halting respiration.
• D (likely room temp, e.g., 25°C): Suboptimal, yielding lower respiration rate than 37°C.

Not enough information on exact choices, but A is optimal.

Final answer: A