Which item is a cylinder-shaped, calibrated glass container that fits into centrifuge slots for the analysis and separation of materials?

• A. Microcentrifuge Tubes
• B. Microcentrifuge Tube Rack
• C. Microcentrifuge
• D. Inoculating Loop

Answer: (A)

The item described is a microcentrifuge tube. These are small, cylinder-shaped containers that hold samples and have calibrated markings to measure volumes. They are designed to fit into the slots of a centrifuge rotor, allowing the samples to be spun at high speeds so that components separate by density. Capable of holding typical small volumes like 1.5 or 2 mL, these tubes are the standard tubes used for centrifugation.

A tube rack is just a holder for many tubes, not the tube itself. A microcentrifuge is the spinning machine, and an inoculating loop is a tool for transferring microorganisms.