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Can a certain substance pass across the cell membrane?
Alaizalgomaifb3409
Also small molecules.
Basically because the cell membrane is amphipathic; a polar head and non-polar tails make up the double layered membrane with non-polar tails sticking inward and polar heads outward. This means that the non-polar middle, the lipid part, does not allow hydrophyllic substances to pass easily through the membrane while non-polar substances can pass through easily. Having to do with charge and solubility.
Wiki User
∙ 11y ago
Wiki User
∙ 9y agoLipid soluble molecules pass through simple diffusion, a type of diffusion in which molecules easily move across the plasma membrane.
Wiki User
∙ 14y agoyes. Lipid soluble substances are highly permeable
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∙ 13y agothey can travel through channel proteins, which are like 'pores' in the the membrane, they are usually shaped so that only one kind of molecule or ion can get through.
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∙ 9y agoThe membrane is semipermeable, which means that not all substances can pass through it.
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∙ 12y agoyes
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When does diffusion occur across a cell membrane?
Diffusion across a cell membrane occurs when concentrations of a substance are higher either inside or outside the cell.
What is used to transport glucose across the cell membrane of certain cells?
frutose
When molecules cannot diffuse across the cell membrane?
Cells have a variety of molecule attached to their membranes. Some of these molecules respond to different stimuli and allow substance to pass in and out of the cell. They can voltage gated, ion gated channels, ligand gated. Cells also engage in pinocytosis, phagocytosis, and exocytosis. This is when the cell membrane engulfs a substance and takes it it or when a membrane bound vesicle fuses with the cell membrane to expel a substance.
When there are different amounts of a substance on either side of the cell membrane an gradient results?
osmosis
Do large cells move across the cell membrane quickly?
A large cell will never move across an intact cell membrane.
When does diffusion occur across a cell membrane?
Diffusion across a cell membrane occurs when concentrations of a substance are higher either inside or outside the cell.
State one possible reason a certain substance can not pass across a cell membrane?
The cell membrane is selectively permeable. Some substances like molecules are too big to pass through the membrane. The membrane allows passive transport of moleculesÊ by filtration, diffusion, or osmosis.
State one possible reason a certain substance cannot pass across a cellmembrane?
One possible reason behind the inability of a certain substances to pass across a cell membrane is molecule size.
Describes the difference in the concentrations of a substance across a cell membrane?
action potential
What term describes the difference in the concentrations of a substance across a cell membrane?
concentration gradient
What term describes the difference in the concentration of a substance across a cell membrane?
concentration gradient
What term describes the different in the concentrations of a substance across a cell's membrane?
concentration gradient
What term describes the different in the concentration of a substance across a cell's membrane?
concentration gradient
What term describes the difference in concentrations of a substance across a cell's membrane?
concentration gradient
What term describes the difference in the concentrations of a substance across a cell's membrane?
concentration gradient
The transport of a substance across the cell membrane against its concentration gradient is called what?
The transport of a substance across the cell membrane against its concentration gradient is called active transport.
What is used to transport glucose across the cell membrane of certain cells?
frutose
