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State one possible reason a certain substance can not pass across a cell membrane?
Wiki User
∙ 9y ago
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.
Wiki User
∙ 9y ago
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What term describes the different 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.
Is an ability of a plasma membrane to allow some substance to cross across the membrane more easily than others?
selective permabiltiy
Movement of a substance across a cell membrane using chemical energy occurs during?
active transport
A substance that moves across a cell membrane without using the cell's energy tends to move?
from an area of low concentration to an area of high concentration (if it is water) the opposite if it is a solid
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.
What is the membrane said to be if a substance is able to diffuse across a membrane?
selectively permeable
If a substance is able to diffuse across a membrane then the membrane is said to be what?
selectively permeable
If a substance is unable to diffuse across a membrane we say the membrane is?
osmotically active
The difference in the concentrations of a substance across a cells membrane?
action potential
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.
Describes the difference in the concentrations of a substance across a cell membrane?
action potential
What describes the difference in the concentrations of a substance across a cells membrane?
action potential
Which term describes the difference in the substance across a cells membrane?
Concentration Gradient.. :)
How do carrier proteins transport substance across the membrane?
The carrier protein changes shape , shielding the molecule from the interior of the membrane.
What is facilitated diffusion across the phospholipid membrane?
Facilitated diffusion is the movement a substance from high concentration to low concentration across a membrane through a transporter protein or channel
What term describes the difference in the concentrations of a substance across a cell membrane?
concentration gradient
