6. A cell uses some of its energy to move molecules by
A. osmotic pressure
B.active transport
C.diffusion
D.osmosis
2007-03-15 09:47:56 · 4 answers · asked by cherryvalley2006 2 in Science & Mathematics ➔ Biology
b is the only one that requires energy
2007-03-16 15:46:09 · answer #1 · answered by wesnaw1 5 · 0⤊ 0⤋
B. active transport
Active transport is the movement of materials through a membrane against a concentration gradient. It requires energy, hence the term "active".
2007-03-15 16:57:27 · answer #2 · answered by Genesiss 2 · 0⤊ 0⤋
sorry to re-direct you, but this may prove useful:
http://en.wikipedia.org/wiki/Active_transport
If its for homework, this site gives you pictures you can re-illistrate, the explanation on HOW the method of movement works, and more interesting facts, if its for personal research, dont forget about wikipedia! =D
(Answer is B)
2007-03-15 16:54:31 · answer #3 · answered by illusion2088 2 · 0⤊ 0⤋
B
2007-03-15 16:54:46 · answer #4 · answered by Brian L 7 · 0⤊ 0⤋