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1. Nitrogen in the plant cell culture media is provided by either ammonia or nitrate salt. In the media
(A): utilization of ammonium cause culture pH to drop while utilization of nitrate cause culture pH to rise
(B): utilization of both ammonium and nitrate result in drop in pH
(C): utilization of both ammonium and nitrate result in rise in pH
(D): utilization of nitrate cause culture pH to drop while utilization of ammonium cause culture pH to rise
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