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the movement of molecules across a membrane against the concentration gradient, from an area of lower concentration to an area of higher concentration of a particular molecule, using energy supplied by ATP.
outgrowths of neurons (nerve cells) that transmit nerve impulses towards the cell body.
a small finger-like projection found on the inner folds of the small intestine, which increases...
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
produced, growing, living, or occurring naturally in a particular region or environment.
having similar parts regularly arranged around a central axis.