biology help please!?

Question

many food particles are poler. how do these get into the cell? short answers please

Answer 1

Actually, most the time the biggest problem isn't the polarity of the food, but also the size. What happens is something called phagocytosis, which is a type of endocytosis, in which the a large portion membrane will fold around a food particle, and pinch off into the cytoplasm. What you get then is a food vacuole, which is the food enclosed inside a membrane, floating around in the cytoplasm. Later, lysosomes will fuse with the food vacuole, hydrolyze and digest all the food, and then teh smaller chunks of food can diffuse out into the cytoplasm.

Answer 2

endocytosis or "cell eating" the proteins on the cell membrane recognize the food particles and form a vesicle around it. imagine a piece of a bubble pinching in and forming a little bubble inside. the food would be inside the lttler bubble.

Answer 3

Smaller polar molecules, such as water, go by passive transport. Larger polar molecules need protein carriers, like channels.