Which equipment spins liquid samples at high speed to separate components?

• A. Peg Rack
• B. Petri Dish
• C. Microcentrifuge
• D. Inoculating Loop

Answer: (C)

Centrifugation uses spinning to separate components in a liquid by density. When a sample is spun at high speed, heavier components move toward the bottom of the tube while lighter components stay higher, creating distinct layers that can be separated. A microcentrifuge is the compact instrument designed for this purpose, handling small-volume tubes and achieving the rapid speeds needed to separate biological materials like cells, debris, DNA, or proteins. The other items aren’t used for spinning to separate mixtures: a Peg Rack holds tubes, a Petri Dish is for growing cultures on agar, and an inoculating loop is a tool for transferring organisms.