Students decided to change the set up to investigate a single-celled organism. They decided to remove the oil layer but keep everything else the same. They allowed the system to run over the course of 10 minutes and collected data in 2 minute increments. They repeated the set up three times with different temperatures.

Question

Students decided to change the set up to investigate a single-celled organism.  They decided to remove the oil layer but keep everything else the same. They allowed the system to run over the course of 10 minutes and collected data in 2 minute increments. They repeated the set up three times with different temperatures.

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What phase of cellular respiration will cause a change in the limewater and how will the limewater change?

A.	
The Kreb's Cycle and the water will turn cloudy.

B.	
Glycolysis and the water will remain clear.

C.	
The Calvin Cycle and the water will remain clear.

D.	
The electron transport chain and the water will turn cloudy.

GPT-4o mini · Answer

The correct answer is: **A. The Kreb's Cycle and the water will turn cloudy.** The limewater is an indicator for carbon dioxide (CO2) levels. When a single-celled organism undergoes cellular respiration, particularly during the Kreb's Cycle, it produces CO2 as a byproduct. If CO2 is present in the limewater, it reacts with calcium hydroxide to form calcium carbonate, which causes the solution to turn cloudy. So, in this case, the Kreb's Cycle, which produces CO2, would lead to a cloudiness in the limewater.