1.   The phones were dead until Leese flipped the master switch.

2.   At one point, the market was plunged into almost complete darkness when master electrical switches were tampered with and employees roamed around the market, disrupting operations.

3.   A mutation somehow created a gene called SRY, for sex-determining region Y, and it became the master switch for creating a male, Page said.

4.   But they can tell from its structure that it is a master switch whose role is to activate other genes.

5.   Individual apartments would have their own temperature controls and a master switch at the front door to encourage apartment dwellers to turn off all the lights.

6.   It also has individual switches on the front for each device attached, as well as a master switch that can turn all the devices off at once.

7.   Other genes make factors that act as master switches, turning yet other genes on and off at particular points in development.

8.   Other items to consider are power strips with plug-ins for all electronic equipment and a master switch to turn everything off at once.

9.   Someone tampered with the master light switches, plunging the market into darkness.

10.   There is a series of switches on the front to control each peripheral, and a master switch that shuts everything off.