MICRO-ORGANISMS AND MICROSCOPES

: Which micro-organism is responsible for causing the common cold?

Viruses

Which of the following is a single-celled eukaryotic organism?

Protozoans

Which of the following micro-organisms lacks a nucleus?

Bacteria

: Which type of microscope would be most appropriate for viewing a live amoeba in a water sample?

Light microscope

Which micro-organism forms a part of the natural human gut flora and can be beneficial?

Bacteria

: Which type of microscope provides three-dimensional images of the specimen's surface?

Scanning electron microscope

Which type of microscope uses a beam of electrons instead of light to view specimens?

Scanning electron microscope

How do infectious diseases like the common cold primarily spread?

Direct contact

Which micro-organism causes diseases by producing toxins?

Bacteria

: For observing the fine structures inside a cell, which microscope would be most suitable?

Transmission electron microscope

Which type of infectious agent is responsible for diseases like AIDS?

Viruses