Example sentences of "[conj] off [prep] [noun pl] " in BNC.

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1 The control of transcription — turning on and off of genes — and so controlling the synthesis of specific proteins , involves signal molecules that enter the cell nucleus from the cytoplasm .
2 The switching on and off of genes in different cells is fundamental to the programme of development .
3 Of course , switching on and off of genes does not in itself result in developmental change ; switching genes on and off acts by changing which proteins are made and this in turn alters cell behaviour by pathways that , to repeat , may be quite tortuous .
4 The Eclipse is exceptionally easy to control , with mains electric ignition , a slow cooking facility , a plate warmer ( in the grill area ) and an oven timer which you can pre-set to switch the oven on and off at times convenient to you ( perhaps while you 're busy entertaining guests before the meal ) .
5 Visual images flashed on and off at fractions of a second to imprint themselves on the subconscious mind .
6 Cold-blooded creatures would need very even temperatures if their intelligence was not to switch on and off with variations in the weather .
7 She fucked him with enthusiasm , they laughed , they did it again and again — on and off for years .
8 They 've been going out on and off for years . ’
9 My husband has suffered from heartburn on and off for years and has recently been diagnosed as having a hiatus hernia .
10 She 'd known its cut and thrust on and off for years now .
11 The Election had been on and off for weeks now .
12 ‘ I should n't think so , ’ he said , ‘ not all of it , but I need it too and can write if off as expenses . ’
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