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B1 (diffusion (Dissolved substances have to pass through the cell membrane…
B1
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active transport
Active transport is the process by which dissolved molecules move across a cell membrane from a lower to a higher concentration
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osmosis
a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.
By doing this, water moves down the concentration gradient.
A selectively permeable membrane allows some small substances to pass through but prevents larger substances doing the same.
stem cells
Stem cells are a class of undifferentiated cells that are able to differentiate into specialised cell types. Commonly, stem cells come from two main sources
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