NURSING EXAM QUESTIONS
MICROBIOLOGY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
Preparative and analytical
|
|
Isopycnic and rate-zonal
|
|
Differential and ultracentrifugation
|
|
None of the above
|
Detailed explanation-1: -Preparative and analytical centrifugation are the two types of ultracentrifugation methods that use high-velocity centrifugation. Preparative centrifugation is used to separate small particles such as ribosomes, plasmid DNA, and RNA.
Detailed explanation-2: -The Preparative Ultra Centrifuge is a device that uses centrifugal force to separate particles of different mass or density, suspended in a liquid with the help of vacuum. Rotating the solution in the tube at high speeds gives the angular momentum of each particle a centrifugal force proportional to its mass.
Detailed explanation-3: -Preparative ultracentrifuges can be operated for different types of centrifugation processes like density gradient centrifugation, differential centrifugation, and isopycnic centrifugation. The particles in a sample are either separated on the basis of their density or their sizes.