Question
Cellular Transport
Cellular transport helps to maintain homeostasis within a cell. The transport can be active (requiring energy) or passive (not requiring energy).
Students are investigating cellular transport. For their first investigation, the students fill a section of dialysis tubing with a starch solution. They tie off both ends to mimic the cell membrane surrounding a cell. They place the tubing inside of a beaker of water. They add an iodine solution to the water. The iodine solution will turn blue-black in the presence of starch. Their observation is shown.
For their second investigation, the students add 10 drops of purple food coloring to a beaker of water. Their observation is shown.
Multiple Choice Question
In Investigation 1, the starch solution changes color inside the dialysis tubing, but the iodine solution remains the same color outside of the tubing. Which statement best explains the reason?
A.
Iodine molecules are small enough to pass through the membrane, but starch molecules are too big to pass through.
B.
Iodine molecules are large enough to pass through the membrane, but starch molecules are too small to pass through.
C.
The selectively permeable membrane allows both iodine molecules and starch molecules to enter and exit at different rates.
D.
The selectively permeable membrane allows both iodine molecules and starch molecules to enter and exit at the same rate.
Cellular transport helps to maintain homeostasis within a cell. The transport can be active (requiring energy) or passive (not requiring energy).
Students are investigating cellular transport. For their first investigation, the students fill a section of dialysis tubing with a starch solution. They tie off both ends to mimic the cell membrane surrounding a cell. They place the tubing inside of a beaker of water. They add an iodine solution to the water. The iodine solution will turn blue-black in the presence of starch. Their observation is shown.
For their second investigation, the students add 10 drops of purple food coloring to a beaker of water. Their observation is shown.
Multiple Choice Question
In Investigation 1, the starch solution changes color inside the dialysis tubing, but the iodine solution remains the same color outside of the tubing. Which statement best explains the reason?
A.
Iodine molecules are small enough to pass through the membrane, but starch molecules are too big to pass through.
B.
Iodine molecules are large enough to pass through the membrane, but starch molecules are too small to pass through.
C.
The selectively permeable membrane allows both iodine molecules and starch molecules to enter and exit at different rates.
D.
The selectively permeable membrane allows both iodine molecules and starch molecules to enter and exit at the same rate.
Answers
GPT-4o mini
The correct answer is:
**A. Iodine molecules are small enough to pass through the membrane, but starch molecules are too big to pass through.**
This choice accurately reflects the principles of selective permeability typically exhibited by dialysis tubing, which allows smaller molecules like iodine to pass through while restricting larger molecules like starch.
**A. Iodine molecules are small enough to pass through the membrane, but starch molecules are too big to pass through.**
This choice accurately reflects the principles of selective permeability typically exhibited by dialysis tubing, which allows smaller molecules like iodine to pass through while restricting larger molecules like starch.