The trail drive cowboys were just as tough as the cows they prodded along, but even a tough cowboy has to eat once in a while. The first trail drives were pretty basic affairs. Each cowboy was in charge of bringing his own breakfast, dinner and supper.
Activation Lock is automatically enabled when you turn on Find My iPhone on your iPhone, iPod touch or iPad. Likewise, disabling Find My iPhone on an iOS device or removing the device from the mobile Find My iPhone app or the web interface at icloud.com/find will automatically disable Activation Lock protection.
Quick Answer. The lock-and-key model refers to the way in which a substrate binds to an enzyme's active site. Similar to how a key has to be the correct one for a lock, no reaction takes place if an incorrect substrate tries to bind. The active site of an enzyme is a specific region that receives the substrate.