CELL MEMBRANE TRANSPORT

critical_thinking_questions_cell_membrane_transport.pdf

CRITICAL THINKING QUESTIONS-

1. The dialysis tubing used in this experiment represents a cellular membrane. Knowing

this, discuss what properties of the cell membrane were tested during this experiment.

Specifically examine what molecule(s) crossed the membrane and what molecule(s) were

prevented from crossing the membrane and why.

2. Survival courses train individuals that when stranded at sea they should never drink the

salt water. Why is the intake of salt water detrimental to health and how does this relate

to your laboratory experience with osmosis?

3. Freshwater protozoa, which are unicellular organisms, have a greater concentration of

salt inside them than does the surrounding water. Does water diffuse into or out of the

protozoa? Explain why this would happen and what protective measures the protozoa

should take to prevent injury or death.