1) possible because there is plant like the Venus flytrap that eat insect(rip insect) that doesn't need sunlight cause it live in shady areas
2) it would be your muscle cells cause you need it to move your body around and wouldn't happen if you don't have a lot of energy
3)The cell must expend energy. Some carrier proteins can do this. They bind the particles on their active sites and release them the other side of the membrane, but they only do this in one direction.
4)Transporters, a third class of membrane transport proteins, move a wide variety of ions and molecules across cell membranes. ... Uniporters transport one molecule at a time down a concentration gradient. This type of transporter, for example, moves glucose or amino acids across the plasma membrane into mammalian cells.
5)Endocytosis and exocytosis are important mechanisms for bringing substances into and out of a cell. Cells use exocytosis to secrete proteins. ... The vesicles fuse with the plasma membrane, causing the contents of the vesicles to spill outside the cell.
