Biology

Biology, 25.06.2019 21:30, ericavasquez824

What is the process by which substances move across the membrane through channels without using energy

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Biology, 22.06.2019 09:00, idk8348

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

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Biology, 29.08.2019 18:30, lordcaos066

The cell is taking in substances through membrane proteins, without any energy expenditure of its own. the substances naturally follow their concentration gradient. however, they must go through the protein channels, because they are too large to squeeze through the cell membrane. this process is called

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Physics, 17.09.2019 21:20, woodsjnjoseph3

Which choice best characterizes k+ leakage channels? view available hint(s) a. chemically gated k+ channels that open and close according to the binding of other molecules b. transmembrane channels that use energy to allow the movement of k+ across the membrane c. transmembrane protein channels that are always open to allow k+ to cross the membrane without the additional input of energy d. common transmembrane channels that are always open for any ion to move through in the presence of k+

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Biology, 07.10.2019 16:10, arslonm777

Some molecules, such as water, , and gases, need no assistance crossing the differentially permeable membrane as they are small and uncharged. these molecules are said to flow down their concentration gradient as they move from an area where their concentration is to an area where their concentration is . called transport, these molecules are able to slip between the hydrophilic heads of the phospholipids and pass through the hydrophobic tails of the membrane. water molecules will enter the cell either by diffusing across the plasma membrane, or in some cells, by using special water channels called that allow larger amounts of water to cross the membrane. substances requiring proteins but no energy expenditure to move with a concentration gradient across a membrane do so through . for other substances, such as those moving against concentration gradients, large or polar substances, or some ions, energy is required through a process called transport. this type of transport allows large molecules and some ions to use proteins to assist them across plasma membranes. these proteins are specific for the substances they transport across the plasma membrane and include substances such as sodium ions, , and glucose.

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