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Passages that permit a cell membrane to be permeable as needed are called?
Wiki User
∙ 11y ago
channel proteins
Wiki User
∙ 11y ago
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What is essential for diffusion?
A- A Concentration Gradient B- A Selectively Permeable Membrane C- A Source of Energy D- A Protein The Answer Is (A) Diffusion can occur without a semipermeable membrane, as diffusion is simply movement of a substance from high to low concentration. A source of energy is needed only for active transport. Proteins are needed if the the particles transported are too big to pass the semipermeable membrane.
In what way are cell membranes selectively permeable?
The cell membrane (also called the plasma membrane, plasmalemma, or "phospholipid bilayer") is a selectively permeable lipid bilayer found in all cells. It contains a wide variety of biological molecules, primarily proteins and lipids, which are involved in a vast array of cellular processes such as cell adhesion, ion channel conductance and cell signaling. The plasma membrane also serves as the attachment point for both the intracellular cytoskeleton and, if present, the extracellular cell wall.
Are all cells sorouned by phospholipid membrane?
Yes, the membrane is needed by all cells. The plant and fungi cells have an additional cell wall, this maintain the shape of the cell membrane.
Where does the materials needed by cells come from?
They cross the cell membrane from the environment.
How does active transport differ from the process of diffusion across a membrane?
Diffusion is the process in which a certain substance achieves equal concentrations in a specific area. Diffusion across a membrane means that the substance is equally distributed between both sides of the membrane, assuming the substance can pass through that membrane (the membrane is permeable to the substance).Active transport is just that, active. It requires energy because it is usually moving substances to a place where they would not naturally move or increases the rate of their disbursing. Active transport can move molecules against a concentration gradient, whereas diffusion cannot.Simply, active transport means that energy is needed to transport the object/molecule while diffusion is a naturally occurring process dependent on the concentration gradients between the membrane.
Can you please list the conditions that are needed for effective gaseous exchange. Thanks?
A permeable membrane and a pressure differential.
What function is cell membrane?
A cell membrane is a selectivley permeable membrane. This means that it only lets specific materials get in and out of the cell. The cell membrane helps to let only needed materials into the cell and to get unneeded materials out of the cell. (food goes in waste comes out.)
What is essential for diffusion?
A- A Concentration Gradient B- A Selectively Permeable Membrane C- A Source of Energy D- A Protein The Answer Is (A) Diffusion can occur without a semipermeable membrane, as diffusion is simply movement of a substance from high to low concentration. A source of energy is needed only for active transport. Proteins are needed if the the particles transported are too big to pass the semipermeable membrane.
What are the two things needed for osmosis to take place?
Partially permeable membrane(visking tubing) and water
Why is it necessary to have a cell membrane on a plant cell?
The cell surface membrane is partially permeable membrance that is made up of double phospholid layers comprising of 1. lipids 2. fats 3. proteins 4. phosphate groups. This is therefore needed for the control of substances in and out of the cells (: margaret
In what way are cell membranes selectively permeable?
The cell membrane (also called the plasma membrane, plasmalemma, or "phospholipid bilayer") is a selectively permeable lipid bilayer found in all cells. It contains a wide variety of biological molecules, primarily proteins and lipids, which are involved in a vast array of cellular processes such as cell adhesion, ion channel conductance and cell signaling. The plasma membrane also serves as the attachment point for both the intracellular cytoskeleton and, if present, the extracellular cell wall.
Describe the purpose of the cell membrane?
the cell membrane keeps the stuff needed inside the cell in, and the stuff needed outside the cell out
What is the funtion of the cell membrane?
The function of the cell membrane is to allow materials that are needed into the cell and the materials that are not needed and/or a waste product are taken out of the cell.
What is the movement of materials through the membrane called?
It's either diffusion, osmosis or active transport. More information is needed to answer the question fully.
Where does absorption of water and other needed material takes place?
At the cell membrane or plasma membrane
What is the meaning of selecting permeable?
Selective permeability refers to the function of plasma membranes that is needed to maintain homeostasis in a cell and prevent foriegn substances from entering through the cells walls. Some molecules can pass, some are blocked
Do carrier proteins require energy?
By definition, osmosis does not require the transport of particles or energy in the process. Osmosis is the movement of water through a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration.
