Cotransport (Symport and Antiport)
Cotransport (Symport and Antiport)
How can a molecule be transported across a membrane against a concentration gradient? Cellular membranes function to keep the internal environment of the cell distinct from the external environment. Concentrations of many molecules differ across cellular membranes. Another function of membranes is to transport materials in and out of the cell. However, because of the difference in environment across the membrane, it is often necessary to transport a molecule from a region of low concentration to a region of higher concentration. Movement up a concentration gradient cannot happen passively, it requires a mechanism to drive the process. The mechanism can be powered directly by the chemical breakdown of ATP to ADP and phosphate or it can be powered by other molecules moving down a concentration gradient.
About BeeGames social
Playground and Play together are the BeeGames social layer — so you're never just playing alone.
What is a Playground?
Your Playground is your own personal game homepage. Pin the games you love, give it a name and a short bio, then make it public to share your personal arcade with anyone.
How do I use my Playground?
On any game page, tap “Playground” to pin that game. Head to My Playground to edit its name, bio and layout, then share your public link with friends.
What is Play together?
Play together lets you co-play the same game with friends in real time. Open a game room and everyone can play side by side while chatting in the room — like crowding around one screen, online.
How do I play with friends?
Tap “Play together” on a game page, pick a public room or a private one with a password, then share the room link with friends. You can also browse and join open rooms from the Lobby.