Which item is a rack for holding up lab equipment when not in use, or for observation?

• A. Petri Dish
• B. Pipette-Aids
• C. Microcentrifuge
• D. Peg Rack

Answer: (D)

A peg rack is designed to hold lab tools and small glassware upright, keeping them organized, visible, and ready for use or observation when they’re not in use. The pegs let you hang items so they dry after washing or can be quickly inspected for cleanliness or readiness. This purpose clearly matches the description of a rack for storing equipment. In contrast, a Petri dish is for culturing samples, a pipette aid assists with pipetting, and a microcentrifuge spins tubes; none of those function as a rack.