2007-01-23 05:53:47 · 22 answers · asked by shannon m 1 in Science & Mathematics ➔ Chemistry
true...by osmosis
2007-01-23 05:56:20 · answer #1 · answered by monetspicasso 3 · 0⤊ 0⤋
True. The cell membrane is made up of a phospholipid bilayer, cholesterol and proteins. It is semi-permeable meaning it can allow things to pass in or out without requiring energy but these things can only be small, non-polar molecules such as O2 or N2. Proteins allow things to pass across the membrane as well. Channel proteins form a channel through which ions can travel. Carrier proteins are like a revolving door; an ion get in on one side and comes out on the other.
2007-01-25 15:54:10 · answer #2 · answered by Anonymous · 0⤊ 0⤋
This is true and also the cell membrane separates the cell from the outside environment.
2007-01-23 05:58:22 · answer #3 · answered by sweetgirl5900 2 · 0⤊ 0⤋
Little bit of both. Small uncharged molecules such as carbon dioxide can pass across the membrane with out any control other than the concentrations each side.
Charges molecules and large molecules require receptors built into the membrane.
2007-01-25 03:43:59 · answer #4 · answered by farueulogy 1 · 0⤊ 0⤋
hi rather. I gave Ceddog a thumbs up for his answer. although, there is one further concern right here. large lipid-soluble molecules do no longer require transport proteins, phagocytosis, or different energetic varieties of 'transport' to pass into cells. the terrific examples are steroid hormones. those large, cholesterol-derived, molecules somewhat purely pass interior the direction of the cellular membrane because of the fact, like the membrane, they are lipids. The receptors for plenty of those hormones are INTRACELLULAR receptors. terrific needs and robust success.
2016-11-01 02:24:14 · answer #5 · answered by ? 4 · 0⤊ 0⤋
True. There are three types of movement across the cell membrane: active transport, diffusion and osmosis.
2007-01-23 06:02:23 · answer #6 · answered by J? 3 · 0⤊ 0⤋
True. Simple non charged non-polar molecules like O2 pass right through the celll membrane's hydophobic core, diffusing down the concentration gradient. Otherwise, facilitated diffusion, active transport, and co-active transport are needed.
2007-01-23 06:01:38 · answer #7 · answered by reginachick22 6 · 0⤊ 0⤋
True
2007-01-23 06:02:21 · answer #8 · answered by bananajcd 2 · 0⤊ 0⤋
I have no problem with helpping people do their homework, but have a big problem DOING someone elses homework. read your books, the answers are in there. I've already paid my dues when it comes to homework, and so now it's your turn.
2007-01-23 05:59:02 · answer #9 · answered by tweetybird37406 6 · 0⤊ 0⤋
True.
2007-01-23 05:57:36 · answer #10 · answered by Anonymous · 0⤊ 0⤋
True, go to link below.
2007-01-23 05:56:59 · answer #11 · answered by Anonymous · 1⤊ 0⤋