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All cells are surrounded by a cell membrane that separates the cell from the outside environment. The cell membrane is selectively permeable, which means...
some substances can pass through the membrane while others cannot.
oxygen and food come in, while waste materials go out.
all substances can pass through it.
it can hear most things but not if they are homework related.
Pretend the red dots are oxygen molecules. What process is illustrated?
Osmosis is the of .
If you put a cell in a hypertonic solution (like salt water), what happens?
It remains unchanged.
What are the two types of active transport?
Transport proteins pick up molecules outside the cell and carry them in.
Transport by engulfing.