“Please!” Gus pleaded. “I need to get inside, even though it’s crowded in there!”
ATP burned one of his own phosphate groups, releasing a burst of energy. Click, whirr. The Uniporter spun, and Gus was whisked inside, moving against his natural gradient. This, ATP explained to a passing mitochondrion, was the first type of active transport: . what are the types of active transport
“Nat!” ATP called out. “I have a deal for you. You’re going to flow inside anyway. But if you do it through this special door, you can drag Suzy along with you.” “Please
And so, in the city of Cytoville, the gates never slept. Because without the three guardians—the direct power of Primary, the clever teamwork of Secondary (Symport and Antiport)—the city would starve, flatten, and fade into equilibrium. And equilibrium, as ATP liked to say, was just another word for death. The Uniporter spun, and Gus was whisked inside,
Later that night, ATP sat by the membrane, exhausted but content. A young vesicle floated by, curious. “So active transport is just moving things against the flow?” it asked.
The vesicle blinked. “What about me? I wrap around big molecules and bring them into the cell. Is that active transport?”