Laboratory-scale fermenters are usually mixed using small stirrers with electric motors rated between 100 and 500 W. One such motor is used to drive a 7cm turbine impeller in a small reactor containing fluid with the properties of water. The stirrer speed is 900 rpm. Estimate the power requirements for this process.

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#Question id: 1121

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following provides the best evidence that cell-signaling pathways evolved early in the history of life?

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#Question id: 1178

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following is a protein kinase?

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#Question id: 14554

#Section 1: Engineering Mathematics

The series 

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#Question id: 2084

#Section 3: Genetics, Cellular and Molecular Biology

Which two organelles are responsible for producing phospholipids and sphingolipids?

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#Question id: 27311

#Section 3: Genetics, Cellular and Molecular Biology

The presence of 2’-hydroxyls in the RNA backbone prevents RNA from adopting a-