Question

1. if i took a play sand strainer and i put rocks and sand in it, how would this be like a cell membrane?

Explanation:

A cell membrane is selectively permeable, allowing certain substances to pass through while blocking others. In this analogy, the sand strainer acts as a barrier. The sand (small particles) can pass through the strainer (like small molecules passing through the cell membrane), while the rocks (large particles) are blocked (like large molecules being unable to pass through the cell membrane without assistance).

Answer:

The sand strainer is like a cell membrane because it is a barrier that allows small particles (sand) to pass through (similar to how the cell membrane allows small molecules to pass through) while blocking large particles (rocks) (similar to how the cell membrane blocks large molecules from freely passing through without specific transport mechanisms).