Nitrates enter the cell through the process of active transport. Nitrates are essential for development of leaves of a plant and are absorbed through root hair cells.
Nitrates enter plants primarily through their roots via a process called root uptake. This occurs when nitrates in the soil are absorbed by the plant's root system and then transported within the plant to support various metabolic processes, such as protein synthesis. Nitrate uptake is facilitated by specific transport proteins located in the root cell membranes.
the process that causes the water to enter and leave the cell is diffusion
The process the cell must use to allow the protein to enter is rather simple and uncomplicated. The cell uses the process of osmosis and diffusion along a concentration gradient to allow for passage in and out of the cell.
The cell Wall
osmosis
Nitrates can enter urine through dietary ingestion of nitrates from foods such as leafy green vegetables, root vegetables, and processed meats. The body metabolizes dietary nitrates into nitrites, which are then excreted in the urine.
Small uncharged substances enter and leave the cell membrane through passive diffusion. This process relies on the concentration gradient and does not require energy input from the cell.
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The process of bringing large undissolved particles into a cell would be phagocytosis, literally "cell eating." Hope that helps! :)
Nitrogen Fixation.
endocytosis
Water soluble molecules often enter or exit a cell through a process called facilitated diffusion. This process involves the movement of molecules across the cell membrane with the help of specific protein channels or carriers.