Exploring Diffusion Through Cell Membranes

What is the main principle behind diffusion?

• Movement of molecules from low to high concentration

• Movement of molecules from high to low concentration

• Movement of molecules against the concentration gradient

• Movement of molecules using ATP energy

What does it mean when a cell membrane is selectively permeable?

• It allows all molecules to pass through

• It blocks all molecules from passing through

• It allows some molecules to pass while blocking others

• It allows only water molecules to pass through

What material is used to create the model cell in the lab?

• Rubber tubing

• Dialysis tubing

• Glass tubing

• Plastic tubing

Which solution is used as a starch indicator in the experiment?

• Glucose solution

• Benedict's solution

• Water

• Lugol's iodine

What color change indicates the presence of starch when using Lugol's iodine?

• Amber to blue-black

• Blue to orange

• Colorless to amber

• Amber to green

What is the purpose of using Benedict's solution in the experiment?

• To indicate the presence of glucose

• To change the color of the solution

• To clean the model cell

• To indicate the presence of starch

What happens to Benedict's solution when glucose is present and it is heated?

• It turns blue

• It turns green

• It turns amber

• It turns orange

Which test tube turned a bright orange color after adding Benedict's solution and heating?

• The test tube with the beaker solution

• The test tube with glucose

• The test tube with starch

• The test tube with water

Why did the solution from the beaker turn a dark orange after adding Benedict's solution?

• Because it contained starch

• Because it was already amber

• Because it contained water

• Because it was heated for too long

Why was the inside of the model cell blue-black after the experiment?

• Because glucose entered the cell

• Because starch exited the cell

• Because iodine entered the cell

• Because water entered the cell