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Do substances enter any plant or animal cell by passing through a cell membrane?
Molecules can not pass through the cell membrane, because endocytosis is important for those large molecules that can not pass through the cell membrane!!
Which the two structure in plant cell are selectively permeable allowing molecules of water and small solutes to pass through but preventing the passage of large solute molecule?
Cell membrane and sap vacuole membrane
What are two factors that determine whether or not molecules can pass through a selectively permeable membrane?
One factor is the channel of the molecule, without them the ions and polar molecules would not be able to pass across. Another factor is the size of the molecule, they determine how fast it will defuse.
What are the molecules in a plasma membrane that provide basic membrane structure cell identity and membrane fluidity?
Phospholipids are the main molecules in the plasma membrane that provide basic membrane structure. Glycolipids and glycoproteins contribute to cell identity through their unique carbohydrate chains. Cholesterol helps to maintain membrane fluidity by modulating the packing of phospholipids.
What is the structure of a cell membrane in plant cells?
The cell membrane is composed of phospholipid bi-layer and proteins. The phospholipids are both hydrophillic and hydrophobic and makes the cell membrane be selectively permeable, that is allows only curtain molecules to pass through the membrane. The proteins function is to determine wchich molecules must go in and wchich shouldn't go inside the cell.
Do substances enter any plant or animal cell by passing through a cell membrane?
Molecules can not pass through the cell membrane, because endocytosis is important for those large molecules that can not pass through the cell membrane!!
What structures allow large important molecules to pass through the cell membrane?
A cell membrane is in every plant and animal and it lets in water, nutrients, and food to the cell. The membrane MUST be permeable because then it wouldn't of let the in water, nutrients, and food into the cell. If the membrane was stiff, the molecules of water, nutrients, and food would not be able to fit into the cell.
Which the two structure in plant cell are selectively permeable allowing molecules of water and small solutes to pass through but preventing the passage of large solute molecule?
Cell membrane and sap vacuole membrane
Where are chlorophyll molecules located within plant cells?
chlorophyll molecules are located in the thylakoid membrane
What is the process through which water is lost through the plant's stoma?
Evaporation. Water molecules have a cohesive property, so as water molecules closest to the stoma evaporate and diffuse through the stoma they will pull the water molecules from the xylem behind them. These water molecules will evaporate too and draw more water up.
What are narrow membrane-lined channels through the cell wall that connect adjacent plant walls?
Plasmodesmata: are narrow membrane-lined channels through the cell wall that connect adjacent plant cells.
What are two factors that determine whether or not molecules can pass through a selectively permeable membrane?
One factor is the channel of the molecule, without them the ions and polar molecules would not be able to pass across. Another factor is the size of the molecule, they determine how fast it will defuse.
What is the external boundary of cell which regulates flow of materials into and out of the cell?
It is called the cell membrane. This is in Plant and animal cells, although the plant cell has the cellulose wall as well. The cell membrane is semi permeable. Water molecules can pass easily through it through a process call osmosis (the diffusion of water molecules).
Which the structure in plant cell are selectively permeable allowing molecules of water and small solutes to pass through but preventing the passage of large solute molecule?
only plasma membrane
What are the molecules in a plasma membrane that provide basic membrane structure cell identity and membrane fluidity?
Phospholipids are the main molecules in the plasma membrane that provide basic membrane structure. Glycolipids and glycoproteins contribute to cell identity through their unique carbohydrate chains. Cholesterol helps to maintain membrane fluidity by modulating the packing of phospholipids.
What is the structure of a cell membrane in plant cells?
The cell membrane is composed of phospholipid bi-layer and proteins. The phospholipids are both hydrophillic and hydrophobic and makes the cell membrane be selectively permeable, that is allows only curtain molecules to pass through the membrane. The proteins function is to determine wchich molecules must go in and wchich shouldn't go inside the cell.
How is passive transport different in plant cells and animal cells?
Plants have cell walls, whereas animals do not. The cell wall changes the characteristics of molecules able to passively (enter and exit) diffuse into plant cells and this also helps to better retain them inside the cell.
