Active transport can only occur at intact, closed membranes. Such membranes can envelop very different compartments, like the whole cell, vesicles, the vacuole, the mitochondrial matrix, the inner thylacoid space of the chloroplasts, etc.
In active transport, the cell has to provide energy for it to occur. The cell doesn't have to provide energy for passive transport.
The size of the membrane pores determines which molecules can pass through.
The membrane of the cell is what determines comes in and out of it.
fast
The cell membrane
Polarity
Active transport can only occur at intact, closed membranes. Such membranes can envelop very different compartments, like the whole cell, vesicles, the vacuole, the mitochondrial matrix, the inner thylacoid space of the chloroplasts, etc.
A molecule would be actively transported when an equal concentration of solutes exist on either side of the cell membrane.
Lipid solubility determines if it will diffuse across. The presence of specific protein carrier molecules determines if it will be transported across the membrane.
the number of transport carriers in the luminal membrane
Phagocytosis.
Only water is transported through the process of osmosis.
Concentration gradient determines the direction of flow.
Some materials cross the cell membrane by diffusion. Some cross through channels. Some bind to receptors and are actively transported.
Water is transported by a passive transport called osmosis. Osmosis is diffusion of water across the membrane.
Embedded in the semi-permeable cell membrane are many different types of carrier proteins or channel proteins. These globular proteins allow the transport of specific substances from the outside of the cell into the cell or vice versa.Specific means each protein can only transport one type of substance across. For example, Protein A can transport Substance X but not Substance Y. Substance Y has to be transported by Protein B which cannot transport Substance X. The specific nature of these globular proteins mean it is easier for these molecules to be transported.
No,they get from outside.They are transported through membrane.
God.