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2007-10-10 09:50:00 · 3 answers · asked by harvardcutie25 1 in Science & Mathematics Biology

i know there are active and passive. im asking for the 2 different types of ACtive transport

2007-10-10 09:54:35 · update #1

3 answers

Active and passive. Active requires the expenditure of energy--such as ATP-coupled transport; while passive does not (and relies solely on concentration gradients/osmotic differences, etc.).

2007-10-10 09:53:25 · answer #1 · answered by Mark S, JPAA 7 · 0 0

Probably primary and secondary.

With primary (direct) active transport, the transport of the compound or ion across the membrane directly burns energy. Molecule/ion X crosses the membrane against its concentration gradient, and ATP is used up in the process.

With secondary (indirect) active transport, the transport occurs "passively", but it is powered by an ion gradient created by spending energy on primary active transport.

2007-10-10 10:26:10 · answer #2 · answered by Anonymous · 0 0

Single molecule protein pumps transport goes across the cell membrane for slow controlled movements.
For bulk movement there is phagocytosis or pinocytosis. Here the membrane forms vescicles to move material.
Perhaps that is the mechanism you are asking about.http://academic.brooklyn.cuny.edu/biology/bio4fv/page/endocytb.htm
http://academic.brooklyn.cuny.edu/biology/bio4fv/page/phago.htm
http://www.cellsalive.com/mac.htm

2007-10-10 10:33:28 · answer #3 · answered by gardengallivant 7 · 0 0

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