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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.
Which term describes the difference in the concentrations of a substance across acell's membrane?
The term that describes the difference in the concentrations of a substance across a cell's membrane is "concentration gradient." This gradient occurs when there is a higher concentration of a substance on one side of the membrane compared to the other, leading to potential movement of the substance from the area of higher concentration to lower concentration, often through processes like diffusion.
How does a polar substance get across a cells plasma membrane without the expenditure of energy assuming it is more concentrated outside if the cell?
A polar substance can cross a cell's plasma membrane through facilitated diffusion, which does not require energy expenditure. In this process, specific transport proteins help the polar substance move down its concentration gradient from an area of higher concentration to an area of lower concentration. This movement occurs until equilibrium is reached.
Where does Cytoplasm occurs in?
Cytoplasm occurs in all types of cells, including both prokaryotic and eukaryotic cells. It is the gel-like substance that fills the interior of the cell and surrounds the organelles. In eukaryotic cells, it is located between the cell membrane and the nucleus, while in prokaryotic cells, it encompasses the entire cell interior. Cytoplasm plays a crucial role in cellular processes by facilitating movement, supporting organelles, and hosting biochemical reactions.
When a cell membrane is completely depolarized the charge on the inside of the cell membrane is what?
When a cell membrane is completely depolarized, the charge on the inside of the cell membrane becomes positive relative to the outside. This occurs due to the influx of sodium ions (Na+) through voltage-gated channels, which reverses the typical resting membrane potential. In this state, the inside of the cell can reach a positive voltage, often around +30 mV, before repolarization occurs.
What occurs when the plasma membrane surrounds a large substance inside the cell and mvoes it outside the cell?
Exocytosis.
What occurs when the plasma membrane surrounds a large substance inside the cell and move it outside the cell?
exocytosis
What occurs when the plasma membrane surrounds a large substance outside the cell and moves it inside the cell?
The process is called endocytosis, specifically phagocytosis if the large substance is solid or pinocytosis if it is liquid. The plasma membrane engulfs the substance, forming a vesicle, and brings it into the cell.
What occurs when the plasma membrane surround large substance inside the cell and moves it outside the cell?
exocytosis
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.
Which term describes the difference in the concentrations of a substance across acell's membrane?
The term that describes the difference in the concentrations of a substance across a cell's membrane is "concentration gradient." This gradient occurs when there is a higher concentration of a substance on one side of the membrane compared to the other, leading to potential movement of the substance from the area of higher concentration to lower concentration, often through processes like diffusion.
In which organelle does osmosis occur?
Osmosis occurs in the cell membrane of a cell. It is the movement of water across the cell membrane, which controls the balance of water inside and outside of the cell.
How does a polar substance get across a cells plasma membrane without the expenditure of energy assuming it is more concentrated outside if the cell?
A polar substance can cross a cell's plasma membrane through facilitated diffusion, which does not require energy expenditure. In this process, specific transport proteins help the polar substance move down its concentration gradient from an area of higher concentration to an area of lower concentration. This movement occurs until equilibrium is reached.
What is the cell membrame?
the cell membrane is a organell that occurs in the animal cell. Its fuction is a protective barrier beewteen the cytoplasma and the outside cell
When a vesicle fuses with the cell membrane to get rid of a particle what happens?
a vesicle does not fuse with the cell membrane. The cell membrane goes through endo- or exocytosis to absorb or eject a substance. In this case, exocytosis occurs, so the cell membrane engulfs the particle, pumps it through the membrane with the help of transport proteins, and then the vesicle breaks off and is gone.
When does passive transport occurs?
It occurs when there are more of that certain molecule on the outside of the cell than the inside. When this is the case, the molecule will automatically pass through the membrane without the cell using energy.
Difference between plasma membrane and cell wall?
wikipedia " plasma membrane" the membrane is thin bi-lipid (two-fat) layer that blocks out water the cell wall is a rigid cube like structure that surrounds a plant cell and gives it rigidity jd
