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The Membrane Vault
Before the debrief: three questions
Same concepts as your pre-check, new questions.
A freshwater fish cell sits in fresh water, which has far less solute than the cell. What happens?
Water enters the cell
Water leaves the cell
Nothing moves
Salt enters the cell
A cell moves calcium ions from a low concentration inside to a higher one outside. This is…
Osmosis
Simple diffusion
Active transport, using ATP
Facilitated diffusion
Why can't Na+ cross the bilayer on its own even though it is tiny?
It is charged, and the lipid interior is nonpolar
The membrane has no holes
Sodium is toxic to the cell
It is too large
See my results