The lakes of northern Minnesota are home to many similar species of damselflies of the genus Enallagma. These species have apparently undergone speciation from ancestral stock since the last glacial retreat about 10 thousand years ago. Sequencing which of the following would probably be most useful in sorting out evolutionary relationships among these closely related species?

#Question id: 4336

#SCPH28 | Zoology

Which of the following processes would result from a mutation that deactivates a regulatory gene of a repressible operon in an E. coli cell?

#Question id: 14332

#SCPH05 I Biotechnology

To ensure turbulent conditions and minimum mixing time during agitation with a turbine impeller, the Reynolds number must be at least 10⁴. A stirred laboratory-scale fermenter with a turbine impeller 5 cm in diameter is operated at 800 rpm. If the density of broth being stirred is close to that of water. The mixing system is scaled up so the tank and impeller are 15 times the diameter of the laboratory equipment. The stirrer in the large vessel is operated so that the stirrer tip speed (tip speed = π N i D i) is the same as in the laboratory apparatus. How does scale-up affect the maximum viscosity. 

#Question id: 4308

#SCPH06 I Botany

Most repressor proteins are allosteric. Which of the following molecules binds with the repressor to alter its conformation and therefore affect its function?

#Question id: 342

#I Life Science/ Life Sciences Group – I-V

In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by ________.

#Question id: 14112

#SCPH05 I Biotechnology