Microscopy and Cellular Discoveries

Before the invention of microscopes, what were some common beliefs about the causes of diseases?

• Demons, witches, or curses

• Poor hygiene and sanitation

• Genetic predispositions

• Environmental toxins

What is the primary purpose of a microscope?

• To magnify distant objects

• To allow observation of details in objects too small to see with the naked eye

• To measure the speed of light

• To analyze chemical compositions

Who was an early researcher known for promoting the use of microscopes as serious scientific tools?

• Antonie van Leeuwenhoek

• Isaac Newton

• Robert Hooke

• Galileo Galilei

In his book "Micrographia," Robert Hooke reported observing tiny structures in plants that he named what?

• Molecules

• Organelles

• Cells

• Tissues

What term did Antonie van Leeuwenhoek use to describe the tiny living creatures he discovered in various fluids?

• Microbes

• Animalcules

• Protozoa

• Germs

Which of the following cannot typically be seen with a standard light microscope?

• Protists

• Bacteria

• Viruses

• Plant cells

What are the tiny packets of light emitted by a light source called?

• Electrons

• Protons

• Neutrons

• Photons

Why are light microscopes generally unable to provide clear images of viruses and atoms?

• Viruses and atoms are too fast for light microscopes to capture.

• The light used in these microscopes is too dim.

• The wavelength of visible light photons is larger than viruses and atoms.

• Light microscopes require a vacuum, which is difficult to maintain.

Who invented the world's first functional electron microscope?

• Heinrich Rohrer and Gerd Bennig

• Max Knoll and Ernst Ruska

• Ara Apkarian and Wilson Ho

• Robert Hooke and Anton van Leeuwenhoek

What do electron microscopes use to image subjects instead of photons?

• Protons

• Neutrons

• Electrons

• X-rays