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Crtive6538
02.08.2019 •
Biology
Large molecules and wastes move through the membrane through
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Ответ:
Ответ:
By means of a carrier protein
Explanation:
There are 3 different types of ways in which molecules are transported across the cell membrane.
Diffusion (passive transport) , Active transport and facillitated transport
Since the cell membrane is semi-permeable,meaning, it only allows certain molecules to cross it so therefore some molecules can easily cross the membrane while others cant.
Small molecules such as water make use of Active and passive transport to cross the plasma membrane.
Large molecules such as glucose or ions cannot simply move across the membrane and therefore makes use of facillitated diffusion
Facillitated diffusion uses a carrier protein or channel protein which will bind to the ion or large molecule, whereby it will alter its shape in order to cross the cell membrane more easily.
Ответ:
Osmosis is the movement of water molecules from a higher water potential to a lower water potential across a partially permeable membrane.
Please note two things:
Higher water potential = High amount of water= low concentration of soluteLower water potential = Low amount of water = High amount of solute.Now, If you want the definition in terms of solute concentration, it should be:
Osmosis is the movement of water molecules from a Low concentration to a high concentration across a partially permeable membrane.
Also, Note that no energy is required for this process.